Great question, that only you can really answer.
My 2p worth
Blackberry = lovely but brave residual wise. Shows the muck, but sets you out as a fun guy.
Black = shows the muck and every micro swirl possible. Looks executive or sporty.
Grey = safe bet. Hides dirt, quite executive, can be made sporty, but can be a bit obvious and looks like you weren't brave in your choice. That more or less describes me.... But...
Green that looks blue = the one that came up at the right price for me. It splits opinions and looks better in the flesh than on photos. Hides dirt pretty well, has a bit of fun to, can pass for executive (it often looks grey).
Blackberry and Black may be slightly hotter in the sun (all 4 are darkish and opinions / science varies).
I love my green/blue/grey 'bamboo'