I found three great themes for Blackberry Curve 83xx. Here are those themes and you must install it OTA from your Blackberry. Enjoy!
1. MiniBold
Mini Bold Theme
2. MiniJavelin
Mini Javelin Themes
3. MiniStorm
mini storm theme
There are still more great themes for blackberry. I will give you another if I find the good one. 
I must admit I’m impressed by this posting. I love my Blackberry and actually got it for free on http://www.daily-stuff.com !
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