If you've chosen a Sense-based custom ROM for your rooted HTC EVO 4G, then there's a good chance that you're using HTC's clock widget. It's nice, sure, but maybe you want something that's a better match for your wallpaper or theme.
If there's nothing in Android Market that suits you (tough crowd considering how many are completely skinnable!), then check out Stoney 666's selection of 3D flip and no-flip clocks. There are about 20 of them so far, but he's open to color suggestions and will turn any flip clock to a no-flip one upon request.
The clocks are flashable .zips, which means you can't install all of them and then change them at will. When a new clock is flashed, the previous one is gone until you flash it again. Find and download the one you want from the xda link below.
Don't know how to flash a .zip on your rooted HTC EVO? Find out how to do it here.[xda-developers]