Tim Holtz Crayons are a great tool for coloring different media!
The Tim Holtz Distress Crayons are nice to have as they don't dry out and become unusable like many of the ink pads and other media do. You can either smudge them or add water to blend them out and they work on different surfaces. This set adds to my complete collection so I'll have them for quite some time to use when creating my cards and layouts. I refer you to Tim Holtz for detailed instructions but unfortunately I'm not allowed to include a link!
Easy to use, pen form of coloring that you can smudge, wipe, add water, blend - wonderful for the new embossed card toppers that call for wiping, blending colors.