Gérard from Montréal sent me a note on this new piece of freeware:

Gloodle is a simple app that shows some hint of the immediate feedback that makes particleIllusion so fun and useable: in Gloodle you just draw on the window and cool things happen. Not much thinking required. There are plenty of controls to experiment with, and (like particleIllusion) a lot of power hidden under simple controls.

Perhaps it can finally break my addiction to Jewel Quest?