You just can’t find your own theme to use with summberboard?
Have a look at the following site
Iphone Theme Maker is a website where you can design your own themes.

You can almost customize everything in your theme via this website.
They currently have the option to upload your own Icons, WallPapers, Dock and Statusbar.

If you’re not that super creative, you can always chose the ones already available.

I like this website as it gives your the option to be truly unique with your iPhone, iPod Touch.

If you have created a theme, you can always send it in, and i’ll place it in our iPhoneFreakz repository.

Enjoy