Here's a compilation of a bunch of clouds
clouds are located in a tab in the gas menu labeled CLDS
I'm open to suggestions for more clouds
Used some code from timpfeifer's cloud mod and TPT_PL's epic exotic chemistry pack
EDIT:
updated to include a clone cloud, use property tool to change it's ctype to what you want it to rain
Hey, you used my code! You should give me any credit, you know? (Otherwise this thread will be locked, and I'm sure we don't want this happen, ay? ;)
Maybe make a cloud that will rain its ctype unless its ctype is a solid. May be pretty hard, you will need the bit.band() function and knowledge of TPT's properties.