A large collection of ASCII art drawings of rainbow and other related nature ASCII art pictures.
            _       _                   
  _ __ __ _(_)_ __ | |__   _____      __
 | '__/ _` | | '_ \| '_ \ / _ \ \ /\ / /
 | | | (_| | | | | | |_) | (_) \ V  V / 
 |_|  \__,_|_|_| |_|_.__/ \___/ \_/\_/  
arc - bow - crescent - band of color - color spectrum
Art by Brian Odom
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  / ,'.-'"""`-.`. \
 | / / ,'"""`. \ \ |
| | | | ,'"`. | | | |
| | | | |   | | | | |
Half rainbow by Brian Odom
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    ,' _-""""
   / ,'.-'"""
  | / / ,'"""
 | | | | ,'"`
 | | | | |
Art by Joan Stark
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              ,##@&::%&&%%::&@##.
             #@&:%%000000000%%:&@#
           #@&:%00'         '00%:&@#
          #@&:%0'             '0%:&@#
         #@&:%0                 0%:&@#
        #@&:%0                   0%:&@#
        #@&:%0                   0%:&@#
        "" ' "                   " ' ""
      _oOoOoOo_                   .-.-.
     (oOoOoOoOo)                 (  :  )
      )`"""""`(                .-.`. .'.-.
     /         \              (_  '.Y.'  _)
    | #         |             (   .'|'.   )
    \           /              '-'  |  '-'
jgs  `=========`
                                . . . ;
                                     .'; 
                                '  '   ';
                                 .  . . ';;.
                                  .  .  . ';;
                                    .  .  ' .
               ,aaaaaa.               .  .   
            ,aaabbbbbbaaa.              .  .
         ,aaabbbccccccbbbaaa.
       ,aabbbcccddddddcccbbbaa.           '
     ,aabbcccddd'    'dddcccbbaa.
   ,aabbccddd'          'dddccbbaa.
  ,abbccdd'                'ddccbba.
 ,abccdd'                    'ddccba.
,abcdd'                        'ddcba.
abccd'                          'dccba
                           _.--'_......----........
                        _,i,,-'' __,,...........___
                      ,;-' _.--''    ___,,......___
                    ,;'_,''   _.--'''    __,,......
                  ,;','   _.-'   _,.--'''__,,......
      .-.        //,'   ,'   _.-'_,.--'''  .-.
     ;. .;      ///  ,-'  ,-' ,-'  .-.    ;. .;
 .-"-.. ..-"`. /// ,'  ,-' ,-'    ;. ..-"-.. ..-"`.
 `. _.(_)._ .'/// /  ,' ,-'   .'"-.. .`."_.(_)._ .'
   "/.' '. " /// / ,' ,'      `. _.(_)._"/.' '. "
   ,';' ';   |||/ - ,'          " .` `.\,';' ';
   |  '-'    \oOoO '              ;` `;`|  '-'
   |         oOoOOo                `-`  |
   \        (_____)                     \
    |        )   (                       |
    `.      (_____)                      `.
MMWwwMmWwMmWwMmWwMmWwMmWwMmWwMmWwMmWwMmWwMmWwMmWwMm
                               __
                      ___----~~~~~~----___
                 _-~~~____-----~~-----____~~~-_
              ..~.-~~--   ___------___   --~~-_~..
            .'_.~.~~---~~~  __----__  ~~~---~` ~`.`.
          .'.~ .'.~~__---~~~        ~~~---__~`.`. `_`.
         ' .'.' /'/~                        ~-.\.`. `.~.
       /'/'/'/'/'/                             `.`.`. ~.\
     .~.~.~.~.~.~                                `..`. .`.\
    .'.'.'.'.'.'                                   \`.`.`.``.
   | | | | | |                                      : .\ \ \ \
 _|_|_|_|_|_|_                                       : \.`.`. .
|  G          |                                       : : : : :.
 |  O  L     |     H A P P Y   S T .                   :: : : :|.
 |   O  U    |                                         || | | | |.
/     D  C    \           P A T R I C K ' S   D A Y ! .| | | | | |.
|         K   |                                       ||| || | || |
 \___________/________________________________________________________
St. Pat's rainbow
                  ..&&&&&&&&&&&&&&&&&&..
               .&&&&&&&&&&&&&&&&&&&&&&&&&&.
            .&&############################&&.
          .&&##%%%%%%%%%%%%%%%%%%%%%%%%%%%%##&&.
        .&&##%%%$$$$$$$$$$$$$$$$$$$$$$$$$$%%%##&&.
      .&&##%%$$@@@@@@@@@@@@@@@@@@@@@@@@@@@$$%%%##&&.
     &&&##%%$$@@**************************@@$$%%##&&& 
    &&&##%%$$@@****                    ****@@$$%%##&&& 
   &&&##%%$$@@**                          **@@$$%%##&&& 
  &&&##%%$$@@**                            **@@$$%%##&&&
  &&##%%$$@@**          H A P P Y           **@@$$%%##&&
 _&&##%%$$@@**_                             **@@$$%%##&&
|   G          |  S T .  P A T R I C K ' S  **@@$$%%##&& 
 |   O  L     |                             **@@$$%%##&&
 |    O  U    |           D A Y !           **@@$$%%##&&
/      D  C    \                            **@@$$%%##&&
|          K   |                            **@@$$%%##&&
_\____________/_____________________________**@@$$%%##&&______________
Line art by Dan 
Rainbow "colors" by Tina Hesman 
Rainbow shape by F.L. Catalyst
                  \       \      `      /         /
                                             '
            \      `    \     `     '    /     /   `   '
    \                       .  *  *  *  *  *  .     /
         `     \    `    *  *  *  *  *  *  *  *  *       /
   \                  * * * * * * * * * * * * * * *  '
       \     `     @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @   /
\  `             * * * * *             * * * * * * * * *   '  /
           `   @ @ @ @ *                 '@@@@@@@@@@@@@@@
      \      * * * * *                     * * * * * * * *  '
  `        @ @ @ @ @        Come            @@@@@@@@@@@@@@@    /
          * * * **      sit under the         * * * * * * * *
\   `   @ @ @ @ @      rainbow & 'sides       @@@@@@@@@@@@@@@  '
      * * * * *        the  Pot of Go          * * * * * * * * /
 `   @ @ @ @ @             with me.            @@@@@@@@@@@@@@@ .
    * * * * *                                  * * * * * * * *.
\  @ @ @ @ @                                   @@@@@@@@@@@@@@@@
  * * * * *      \---,                           `  `    '  '
 @ @ @ @ @  ____/' \  /                        `   \   @   / '
* * * * * /`  _ .~ ./\                           `   @ @ @  ' '
  __    /  \ \   ^ '                           ` \ `@_@_@_@'/ '
 (x \ ( \ _  \_\  \_\                             (         )
    \ \/ / \/ `-'__`-'         _       `'          \ $ $ $ /
 - - ~'- - - - (   @  )- --`'-   -  -    - -  - `'- --  ------
         -    --``~~~''--          --            -
                             -            ---        - -
    --_-   ___  -      ---          --                  ---
                  --             -       - -