Today while I got some cool themes of Christmas for blackberry devices. These themes are absolutely free. The OS where they run smoothly are.BlackBerry OS: 5.0

Theme Name: EW! Serenity - The cool, calming theme for the 9700. All New HD Icons & Transitions!
Author: mobiworld
Theme Cost: Free
Theme Credits: RIM (All stock graphics)
Supported Device Model(s) and OS: 83xx/85xx/89xx/Bold 9700 OS 5.0
Download Link(s): Free Blackberry Themes