Now that we finally have the tournament rules, we know how terrain will work in organized play. There are two options:
1) Players make a deck from official cards, bring the punchcard terrain that goes with them, and (optionally) bring 3d terrain to put on top of that punchcard that fits inside the footprint.
2) TO puts out custom terrain, invents rules for it based on guidelines in the tournament pack, and marks each terrain element with what rules it has. (See "Using Existing Terrain" on page 6 of the tournament regulations).
My playgroup comes mostly from a Warhammer Fantasy background, so option 2 appeals a lot more to us. Plus, our store has a huge amount of pre-existing terrain, and I've been working on more.
I made a thread for terrain cards before, which is here if you're interested:
However, the new tournament rules make this thread obsolete for a couple of reasons. Mainly, dangerous/defensive no longer matters for custom terrain. This actually makes our job as TOs a lot easier; before, you would need to put out 6 pieces of terrain for each table (2 per card), but now we only need 3. So I decided to design a card to support this.
I removed the dangerous/defensive indicator (since it no longer matters) and shifted the keywords to take up the entire bottom half of the card. This makes better use of the card real estate and makes the keywords more readable. Then the entire upper half of the card (other than capacity and name) can be used for the image.
If you're planning to print the cards yourself, then cut them out by hand, I suggest this template: https://drive.google.com/file/d/0B2OYzQ4YZGLca2h0OWNCU0hvajQ/view?usp=sharing - You can laminate or sleeve them to make pretty decent cards without a lot of effort. If you'd like a scan of the card-backs, it can be found in the old thread.
If you're planning to get the cards professionally printed, I suggest this template: https://drive.google.com/file/d/0B2OYzQ4YZGLcTGhmT0pacTBmcE0/view?usp=sharing and this card-back: https://drive.google.com/file/d/0B2OYzQ4YZGLcV1V6bzVVQnUyTW8/view?usp=sharing - Professional printers are generally not super accurate with their cutting, so they suggest a border. I think black border looks better than white, so I made this design with that in mind. The printing service I'm planning to use is here: http://www.printerstudio.com/personalized/bridge-size-custom-cards-blank-cards.html (and yes, these cards are "bridge size").
Finally, here's a couple of pieces I mocked up real quick as examples:
