Painting a Bathroom Countertop to Look Like Granite?

I painted my bathroom counter with melamine paint. It looks nice, but not a granite look. Could I put that look over my melamine and how would you do it? Please help in directing me step by step in doing this. Thanks in advance. My bathroom countertop is in a light grey, my walls are dark grey. I would like some colour on the countertop. I like browns and beiges also could this go with it.

By Bonnie