Usually I prefer solid colours over transparent finishes (with the exception of anything blue, and the current PDN series, which are astonishing) though keeping an eye on the Silo specials as I do, pickguard colour has a lot to do with it too. My favourites so far have been Envy Green (a limited run in 2004, with Abalone pickguard, and there was a Japan only run of Lukes with gold hardware), Carbon Blue Pearl (discontinued, looked beautiful with the also now discontinued Abalone or Moonstone pickguards), Graphite Pearl (again discontinued, stunning with moonstone pickguard) and of course the Buttercream 2005 LE (which I really didn't like on guitars without the tort pickguard).