You can also create mandalas or radial designs with all your stamps.

To create Mandalas with stamps all you need:
 
Stamps of all shapes and sizes
Ink Pads
paper in different colors
your imagination
Now,  just start in the middle of the paper and create circles of stamps around your first circle. Basically,  you create a target design of stamps.  Here is a simple stamp mandala.
Get more detailed as you do more.  Try making some stamps closer or further apart. You may even choose to overlap stamps too.

The more stamps and colors the better.

You can also paint with stencils over or below this stamps composition.