As mentioned on page 23 of the Learn to Play book, custom terrain is encouraged for this game. My intent is to make cards for many of the terrain elements at my local store. I've created a Photoshop template for people to use creating custom terrain elements; just hide and unhide layers as necessary and edit the text to suit your needs. Huge thanks to @SirWillibald for all his help; this template wouldn't have come out nearly as nice without him. Here's the link: https://drive.google.com/file/d/0B2OYzQ4YZGLcT3dScnRXd3ItcFk/view?usp=sharing
In case you don't have Photoshop, here's some resources for you to recreate a similar file in GIMP or whatever:
(click the image, then click "Full size" on the bottom-left to get to the full 600 dpi version)
Fonts:
Terrain type
Almendra Bold
https://www.fontsquirrel.com/fonts/almendra
Features
UglyQua Italic
https://www.fontsquirrel.com/fonts/uglyqua
Removing the Moire Pattern: https://www.thoughtco.com/remove-moire-patterns-from-scanned-photos-1700238
And finally, here's a couple of sample cards I made for the terrain at my local store:
Haven't tested these yet; the house may be a little OP, but it seems like it should provide more cover than the forest and at least as much fortification as the crumbling wall, so that's what I went with. The "Infantry only" restriction seems realistic and helps some with the power level (no way a Rune Golem is fitting through that door) and at 3 trays max you're not going to be sticking a really deadly unit in there. So I guess we'll see.
Edited by Zetan