One of the things that may make it simpler is that a lot of the LPC tiles (like dirt, grass, and sand) and meant to be used as an overlay, aren't they? There are obviously ones that have transitions from sand <-> water, for example, but those tiles don't exist for every combination.

I may get around to fixing that, but for now, I've got one set with all (?) the water variants, with animations :) It doesn't include transitions between the different water variations, since I have six variants so far, and that's 30 transitions, plus animations... That's a lot.