One of my new Christmas books was Gelli Plate Printing by Joan Bess. I already have a rectangle shaped plate and a round one (neither of which have been used yet). I intend to experiment by printing on fabric and paper. You can do a lot of interesting images and patterns using this method of printing. .
Check this tutorial about How to use a gelli plate . The two gals present a lot quick ideas.
Here's a link to Gelli Art with Joan Bess.
There's a lot of videos out there. I did a search for Gelli Plate Printing and got lots of interesting stuff.