Borders and background

I'm probably not the first to work these out (the desins have been around
for thousands of years).

 ___  |
|  _| |
| |___|
|_____ 

This can be tiled for a background

 ___  |  ___  |  ___  |
|  _| | |  _| | |  _| | |
| |___| | |___| | |___| |
|_____  |_____  |_____  |
 ___  |  ___  |  ___  |
|  _| | |  _| | |  _| | |
| |___| | |___| | |___| |
|_____  |_____  |_____  |
 ___  |  ___  |  ___  |
|  _| | |  _| | |  _| | |
| |___| | |___| | |___| |
|_____  |_____  |_____  |
 ___  |  ___  |  ___  |
|  _| | |  _| | |  _| | |
| |___| | |___| | |___| |
|_____  |_____  |_____  |

A simple repeat of this
| |\ \ | |
| | \ \| |
| | /\   |
| |/  \  |
| |\ \ \ |
| | \ \ \|
| | / /| |
| |/ / | |
|   /\ | |
|  /  \| |
| / / /| |
|/ / / | |

gives this

| / / /| |
|/ / / | |
| |\ \ | |
| | \ \| |
| | /\   |
| |/  \  |
| |\ \ \ |
| | \ \ \|
| | / /| |
| |/ / | |
|   /\ | |
|  /  \| |
| / / /| |
|/ / / | |
| |\ \ | |
| | \ \| |
| | /\   |
| |/  \  |
| |\ \ \ |
| | \ \ \|
| | / /| |
| |/ / | |
|   /\ | |
|  /  \| |
| / / /| |
 
Here's another

|\ \  / /\ \/| |
| \ \/ /  \ \| |
|  \  / /\ \   |
|   \/ /  \ \  |
| |\/ /\ \  / /|
| |/ /  \ \/ / |
|   / /\ \  /  |
|  / /  \ \/   |
|\ \  / /\ \/| |
| \ \/ /  \ \| |
|  \  / /\ \   |
|   \/ /  \ \  |
| |\/ /\ \  / /|
| |/ /  \ \/ / |
|   / /\ \  /  |
|  / /  \ \/   |
|\ \  / /\ \/| |
| \ \/ /  \ \| |
|  \  / /\ \   |
|   \/ /  \ \  |
| |\/ /\ \  / /|

and another
\ \  / /\ \
 \ \/ /  \ \
  \  / /\ \ \
   \/ /  \ \ \
   / /\ \  / /
  / /  \ \/ /
 / / /\ \  /
/ / /  \ \/
\ \  / /\ \
 \ \/ /  \ \
  \  / /\ \ \
   \/ /  \ \ \
   / /\ \  / /
  / /  \ \/ /
 / / /\ \  /
/ / /  \ \/
\ \  / /\ \
 \ \/ /  \ \
  \  / /\ \ \
   \/ /  \ \ \
   / /\ \  / /
With a bit of effort this can be made into a frame
       /\      /\      /\
      /  \    /  \    /  \
     / /\ \  / /\ \  / /\ \
    / /  \ \/ /  \ \/ /  \ \/
   /\ \ \  / / / / / / / / /  
  /  \ \ \/ / / / / / / / / /
 / /\ \ \  /\ \  / /\ \  / /
/ /  \ \ \/  \ \/ /  \ \/ / /
\ \ \ \ \ \ \ \ \ \ \ \ \ \ \
 \ \ \ \ \ \ \ \ \ \ \ \ \ \ 
  \  / /\ \  / /\ \  /\ \  /\
   \/ /  \ \/ /  \  /  \  /
   / /\ \  / /    \/    \/
  / /  \ \/ /
 / / /\ \  /
/ / /  \ \/
\ \  / /\ \
 \ \/ /  \ \
  \  / /\ \ \
   \/ /  \ \ \
   / /\ \  / /
  / /  \ \/ /
 / / /\ \  /
/ / /  \ \/
\ \  / /\ \
 \ \/ /  \ \
  \  / /\ \ \
   \/ /  \ \ \
   / /\ \  / /

-- 
,oooO  _            _
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