What other suit colors can i wear in a law firm that requires business attire during the summer?

I have a summer internship/clerkship in a law firm and the dress code is business attire. Aside from Gray, Black, Navy Blue colors in a suit, is it appropriate to wear other colors? and what will be suited in that kind of work place environment?

Thank you very much!

Tan, or a linen suit, sounds a bit cliche I know but I have seen some very nice ones.