New theme maker version is available from:
https://garage.maemo.org/frs/downloa..._1.0_beta2.zip

It will produce themes that work on all nokia internet tablet devices and firmwares (N800 and 770). I had to drop support for background image for this version. It will come in some form in a near future release.

Notice that the template image size is a bit bigger than previously and the colors are now in the image itself, on the very right side of the image. For the colors, thanks goes to tigert and mdk who work at nokia. Give lots of kudos to them.

There is also an example theme that you can download and test, nuvotheme: download here.
https://garage.maemo.org/frs/downloa.../NuvoTheme.deb
I think it's pretty sweet and I use it myself these days.