The Sidekick ID, that we’ve been hearing so much about in the past few days, has been spotted wearing a variety of fun colors. The “lite” version of the Sidekick was leaked on T-mobile’s website, in a T-mobile rebate form (they just can’t seem to keep this thing under wraps). It seems T-mobile will be offering a handy $50 kickback for new users, with a launch date of April 18.