We played with Aqua Color Crayons on our 2nd project. I have these and use them occasionally. We also used the Dove Blender to blend - note: don't over blend, ruins the cardstock. We played with the set Hoppy Birthday, a Rewards Level A set (which I have! Yellow highlight is how I know what I have).
You can also find this set in the online catalog. Just click on the picture in the sidebar. It'll be in the first set of PDF pages.
This was fun to color. We used 2 shades of green, 1 yellow, 2 browns. In real life this is very pretty but one can see where I over blended.
I probably should have blended a bit more on the leg but my paper was showing roughness where I had too much blender fluid. Maybe I can go back now that it's dry and do a bit more touch up. I'll have to try.