I just downloaded new app called Themebuilder v1.0a by MxWeas. It makes custom summerboard themes, no computer needed. There is also a demo image pack you can download to get started, but you can use mobilefinder to copy your favorites png files into the themebuilder folder. Great addition to summerboard and he plans to add Customize features next and possibly replace summerboard and customize altogether. Definitely worth checking out.