Followed Trish's advice and used a dark paper for the background. Cut a piece of Heat and Bond(one brand of fusible webbing) to place on top. Used heat gun to get the webbing to melt. You can see that it bubbles and separates as it melts.
I had cut the Heat and Bond larger than my paper, so I tore off the edges and added them to the top and reheated (I like texture).
Used a variety of embossing powders to sprinkle over the hot melted webbing, and reheated with the heat gun.