this was the general idea:
http://www.rod-crafting.com/articles/marbling-help.html
I just mix up a batch of finish, take about 4 drops of it and put it on some aluminum foil - (do this for each color). Then get the testors paints in the colors you want. Make sure the pigment settles to the bottom and pour off all the clear solvent. Its ok if you get some of the solvent, but you're after that pigment. Takes VERY little pigment to color those 4 drops finish.. just coat the end of a toothpick and mix it in to the epoxy on the foil.
once you have the colors mixed, put the rod in the dryer and coat the area with plain finish like you normally would. Then just start dipping the toothpick into the colored finish and put "drips" or dots of it into the finish all over the area you just coated. once it starts looking like dalmatian spots take the toothpick and start making squiggles and curly cues in the spots.
its really pretty easy, try it on a practice blank once and you'll have the hang of it.
the top rod was black underwrap with OD-green testors paint and it looks the best so far i think.
