To be honest I do not know how to download a theme on a computer and send them to the Curve via the USB cable. What I do know how to do is this, themes4bb.com and crackberry have good themes and most of them are free. I have downloaded three so far and they all came from themes4bb.com. What you need to do when you find a theme is look to see if you can download it OTA. Which means over the air. Once you find a theme you like click on the "download OTA" link that is usually under the preview of the theme. Then just follow the prompts on the screen to allow the download. The sight is a little hard to find the kind of theme you are looking for but it's worth it. I have a pink autumn theme that looks great. Let me know if I can help you any further or if you get stuck. Happy theme hunting!