These videos were meant to be simple...there are more advanced techniques to use. I have learned the hard way that adding too much color at the wrong time diffuses the color...I have a really nice green blank that came from that. It is camouflage so if you want to hide your pen from the enemy that will be the one. If I was going to try to get more swirl, I would have mix and poured more of the colors together and let if set up longer, then swirl with a tooth pick.
This technique in the video will get you started, there are more that will come along and show more advance features and how to make it sparkle and dramatic.
The color mix in there is a little bit of black. I have to say that power tools make things easier and give you more time to devote to turning the pens. I have not had a depressor break yet and I have made probably 30 batches this way. More to come...
best of luck,
Grub32