Any programs that make themes for WM2003 will work for WM5. If you do a search, I am sure you will find all the info you need. I use ThemeMaker McDeb, but there are free options out there.
Assuming the K-Jam is the same as the Qtek 9100, you can modify the look of the dialer by editing bitmaps (gifs, bmps and pngs) in the windows directory. They are hidden system files so make sure your file explorer is setup to view hidden files. The files names that you want to look for are:
dlrback_*.png (background images)
indialer_*.bmp (smart dialer images)
After you edit the pics, you need to copy your edited versions over the ones in your windows directory (make sure you backup the original files). Activesync won't let you copy over them so I copied them to my miniSD card and then used Resco to copy them to the windows directory. Soft reset your K-Jam and your done.
Here is what my today screen and phone dialer look like after some quick edits:
If anyone wants my edited pics or theme, just respond to this thread and I will post them.