When I was in Holland last November, it was KreaDoe craft fair. Now for years I have been keeping my eyes open for something called liquid aplique. It comes in all sorts of colors, is some sort of paste in a tube, and when you heat it with a heatgun it all puffs up.
So as we were at the fair, and I had spend ALL my money, we were back at one of the last stands, and OMG there it was!! So I borrowed some money of my aunt, and bought myself a tube :)