Thunderstorm Live Wallpaper v1.5

  - New Feature: Randomize colors
  - New Feature: Selectable background image
  - Update: Higher res cloud art
  - Update: Better background art
  - Update: Better Xoom performance
  - Update: Better blending (less color banding)
  - Update: Higher res icon/thumbnail art

Quite a big list of changes there, but most of them are all in the name of getting Thunderstorm to hold up better on a large screen.  Especially with the cleaned up artwork, new backgrounds, and blending improvements I think it's worlds better than it was previously on a Xoom or similar device.

We had a request to be able to randomize the color of the lightning bolts, so that's in there now -- the color dice get rolled every time a bolt strikes.  In addition, we made a couple of different background images instead of just the single one that was available before.  Pick your favorite!