Print Bed Pattern

I was trying to decorate my Interlocking Wall Blocks

https://www.thingiverse.com/thing:4209868

And eventually ended up with a simple solution:
- Design a shape - rectangle the size of your print bed for instance - of one or 2 layers high
- In your slicing program, select the desired pattern and filling ratio
- Deselect top and bottom layers (so 0 bottom and 0 top layers)
- Sidewalls are optional, adds some rigidity, I added them, but may very well not be necessary, just try and let me know.

Doesn't need much filament, and the effect is interesting.