Paint's up to you. A lot of my rockets start looking the same. Black body
with Red, Yellow or Orange fins and nose cone. Sometimes I will vary that of
course. Depends on the rocket. My GeeTee green tube fin rocket is all green.
R-Tee and B-Tee are all red or black. Green Tube Fins/GeeTee, get it.
My next tube fin rocket will be a 5 3/8" rocket called Or-Tee (orange tube fins).
You could do a all silver for a antique-missile look for yours, that would be a
little different.
Lately I've been trying out non-traditional colors for my scratch built rockets, especially metallic colors such as gold, copper, brass. Krylon has a good selection of these: