Bright Colors - zashley icons

Hi...I looked in the sections of the memories that it would make sense for this to be under (coloring, layers, etc) but didn't find the effect I was searching for.

The icons under the cut are from the ladies (i believe they are all ladies) of intensifyslowly. I'm just wondering how to get the bright coloring effect of these. The greens, blues, and pinks really pop and they just flow sooo well. I'm in love with the effect and would love if someone could help me out.

I've tried to recreate it with my CS2, but I just can't quite get it.






Thank you so much for any help you can give me!