just did it.. however, I'm not going to be releasing anything quite yet because I don't know if the ranges for animating colors are the same across all tilesets (I only had a few screenshots of diamondus to work with..) and since I use a Mac it'll be a little while before I get a chance to check on JJ1 on a pc.. but if you'd either check for the specific ranges of animations for deckstar and tell me the blocks.### file I'll pump it out for you (a series of jj1 screenshots in deckstar would also suffice..)

The program also generates the "black background" for all tiles with transparent pixels (although I guess you could just use layer 5 in jj2, but does that not show up in low detail mode? I can't remember, but I thought I used to have a reason for including those kinds of tiles in tilesets)

Tomorrow I'll try to get the actual gradient background generated..

I'm just practicing playing with jj1 tilesets before I have one final go at the tileset compiler which I'm 99% certain I'll finish this time ;P

preview image of diamondus (Please tell me if anything looks messed up.. I wrote all the code this afternoon and I wouldn't doubt there are bugs)

Later I'll add blank tiles so it's like 1 animation per row or something..