How to remove themes from your BlackBerry bold 9000/9700. some downloaded themes drain your BlackBerry battery quickly. you should remove these old themes to free up memory. You can remove added on themes directly. just go to themes, you can select that theme and the menu should give you the option to delete.
1) On the home sceen, click the options icon
2) Click Theme
3) Highlight a theme
4) Press the Menu key
5) Click Delete
if you can’t find delete option for some themes , you will need to go to options> Advanced Options> applications > select the theme you want to delete. Sometimes, you have to restart your BlackBerry bold after you delete some themes.