I like the use of the theme in this one. I included it in my ProcJam compilation:

It's functional, it fits the theme and it's satisfying to generate a really nice thick frost. 

That is a nice little toy! I think the patterns that generate radially in all directions at once look the best, as opposed to the ones that feel like they are pointing in a given direction; I wish there was a way to influence them to only grow like this :-)