I'd love to do coloring as a profession. Or work comics in general. Even if it meant taking out the trash at a comic company.
Coloring is very fun. Same reason, I think I enjoy (Star Wars) LEGOs. To take something (black and white drawing) and bring it to life (same idea of all these LEGO pieces coming together to be a beautiful X-WING or whatever). It soothes the creative mind in my skull that often finds no peace.