There are a couple of fans here who make these, I forget their names off the top of my head, but one makes stickers (considered to be better than the Yamatos due to the fact that they are made of thinner material, more like the old Takatoku style,) and another that makes water decals (I think he makes the standard ones, as well as sets for customizing...) I've been meaning to pick these up, but I seem to keep blowing my cash on toys as I collect retro, and new stuff (basically I'm a mecha whore.) Wise decision to post this question at this juncture, by the way. And welcome to the boards.
Edit: Looks like Takatoys and Anasazi were the ones I was thinking of, Eugimon and RT Shark beat me to the punch!!!