I have green star polyps, an electric green mushroom which isn't doing so hot, and brown button polyps (zoos).
The GSP is thriving. Climbing the walls of the glass and fully extended. I don't know why the mushroom is looking so weak, could be the heat from the day now that summer is here. In fact all my mushrooms other than ricordia are doing poorly (in my other ten gallon).
Basically any zoos, mushrooms, and star polyps are ideal for picos. But there are more out there, can't really think of any, just depends on the size of the tank and the space a coral needs. If something gets too big, you can always frag.
That sounds awesome about your dorm room. I wish I knew about micro reefs when I was in college, would have been great.