The boys got a Doodle-Track Car Set for Christmas. Here it is in action. I had a great time with it. I experimented with different lines and thicknesses and then I tried some patterns to see what it could do. It's a fun toy.
I haven't yet, but want to try it with a regular sharpie marker. So far it has worked fine on the blank side of wrapping paper. Below is an affiliate link where you can buy it from Amazon.