As you know, there are a few limitations that come with only 4 sample banks available on the KP3 if you want to jam with internal samples.
Here is a nice workaround:
By using each of the 8 slices of the 4 sample banks as full loop itself, you have up to 32 small pattern to create full songs with.
I just uploaded this small pack with 2 kp3 files ready to use on your KP3:
http://www.megaupload.com/?d=UIJU17OG
Just set the Tempo to 80bpm (this is because of the longer sampling time on lower bpm - the beats originally run at 160bpm

By switching different slices on and off, you can create full songs with this beast. I also included a short song which was completely arranged on my KP3.
Have fun with it!