I love the overall look of it. Vintage looking cabs are my favorite. I'd choose more of a colour theme if I were you. It looks very haphazard. Blue, yellow, green and red. Martha Stuart will be turning over in her jail cell! Yellow and blue works... I would have went: yellow cab, blue marquee, yellow buttons, blue trackball, blue spinner, and maybe a custom blue balltop. That would be beautiful.
It's not bad, just a little busy.