I really like the crayola retractable colored pencils for doing my adult coloring books with. I can get them finer lined than with crayons.

LOL...I can kinda relate to your obsession but with markers along with those colored pencils......I took my box of them for the kids to use at VBS crafts that I was heading up......they said WOW, they had never seen so many different colored markers before including pens that are metalic. I mix & match what I use in the adult coloring books to give different textures......it's easy to get hooked on things like that.

I also enjoy my water color pencils....makes water color painting a bit easier because I haven't got the hang of water color paints yet.