A couple of months ago I promised a solution to the relative expensive Gelli plate.  Here is a recipe for a very good alternative.
4 pkgs of Knox gelatin
1and 1/2 cup po hot water
1 cup of alcohol
1/2 cup of glycerine

mix together and pour into a shallow pan or container.  Let set up on a flat surface.  Refrigerate until hardened.  Play with as you would a Gelli plate.  Return to fridge to harden.  If the plate gets torn or worn pull it up from the pan and place in a microwave safe bowl and gently heat until liquid.  You might want to skim the bits of paint that might be on the surface.  Pour into shallow pan and allow to set up and then return to fridge.  This appears to be something you can do over and over before having to start a new batch.  Some like to take the sheet out of the pan for use but it seems to hold up better for me in the pan.
Check out the Gelli projects on YouTube.  So many fun printing projects.
This recipe came from Patti Parrish on Youtube.  Thank you Patti.