I think color pencils are highly under-estimated. In our home, we have them lying around, to be used by young nephews and nieces to keep them occupied while adults are busy with whatever they are doing. If you notice color pencils come in a wide range of colors and are relatively inexpensive. They can be used wet or dry and can give fine line edges as well as blends of colors. I have some more ideas which will fructify soon.. wait for them!