Over at XDA there is a thread with multiple themes for CM7.
I installed the Monochrome one, but some thing haven't ported over because of the newest nightly builds each day.
It seems to only work this way. Download to CPU> Transfer to SD. Once on your phone open Linda Manager (or whatever you use) and transfer it to the CMTheme Folder. Reboot into Recovery and Flash it out of the CMTheme folder. Do not wipe anything.
That's how I got mine to work.
Enjoy.
[THEME] Themes for CM7 - xda-developers
I installed the Monochrome one, but some thing haven't ported over because of the newest nightly builds each day.
It seems to only work this way. Download to CPU> Transfer to SD. Once on your phone open Linda Manager (or whatever you use) and transfer it to the CMTheme Folder. Reboot into Recovery and Flash it out of the CMTheme folder. Do not wipe anything.
That's how I got mine to work.
Enjoy.
[THEME] Themes for CM7 - xda-developers