If they have this one on the PaB wall, I could use an entire large container filled with them:
http://www.bricklink.com/catalogItem.asp?P=3741
If they have this one in trans-clear, i could use half a large container and you can fill up the rest of it with whatever, white bricks are good, so are dark red, and so are 2×2 tiles or other plant parts:
http://www.bricklink.com/catalogItem.asp?P=3023
Or you could take a couple pics of the wall and post them and everybody would think you’re extra super awesome.