I took some time to edit the electricity tiles so that they look MOAR electrical and less blob-like. The molecular tiles aren't my personal favorite, but they probably came out the best of all of these.  I recall tuning them to fit together better, so most of the tiles should. The water tiles took forever to align and still didn't come out perfectly, but I have no idea where to go from there, so I'm leaving them alone lest I screw them up... again. And lastly, the cloud tiles are my favorite idea, even though I never did succeed in making the main three tile by three tile section look less bland - I don't think I ever will.   I had a few other ideas as well, none of them very original: Some ice walltiles would be nice, but Hyperspace already has a set that works fine and someone else already posted some animated ones that would replace the asteroids... besides, the ones I did attempt looked like just a bunch of squares. Walls made out of literal fire would be cool, but probably be even tougher to fit to a square pattern than the ones I've already tried, and Brain mentioned using door tiles to make animated fire anyway. The water tiles made me think of constructing a set entirely out of bubbles and replacing the bubble with a water droplet, but the droplet would probably be too large to look natural and each of the tiles in the bubble set would look basically the same.  On that note, however, some rain tiles might go well with the cloud and electricity ones... And since the tiles aren't absurd enough, why not some plant tiles?  Leaves?  Trees rooted in chunks of earth? My final idea (and one of my better ones) was a simple granite set.  I'm not even sure what granite looks like, but a base could be designed entirely around the shelf rock theme: a base that is made of thick walls that contain "gas pockets" of anti-Thor's Hammer tiles to render wallbombing and thorstorms nearly useless, but also has a scraggly interior that is therefore difficult to fill with gunspam and is shorter in length overall to fit its wider walls into the same space as other bases.