These are subtly nightmarish to me, especially the first. The beauty of such ornate mosaics (in the real world) is the clean, symmetric geometry. Ironically, that's the sort of thing you might naively think a computer could be especially good at (compared to more "organic" subject matter). These are evocative of tiles Islamic mosques if you squint at them, but if you look closely they're a blurry tangled mess. I would totally buy this as concept art for a demonic church or something like that.

Edit: I think the third link showed up while I was typing this comment. Those hit me entirely the other way - really cool!