I color most of my images on glossy cardstock with Stampin'Write markers...but first I moisten the image with the blender pen, lay on the color, then blend it. I find if you work with damp color, it blends so nicely...and it's soooooo easy! If you look in my gallery, both the starfish on the shaker card and the seahorses on the "It's Your Day!" card were colored like this. Super fast when mass producing for swaps.