In a way, drag tracks can be easier to make than road textures because you don't need to worry about them lining up six miles from where you begin. So, browse this site to find textures you like.
http://grsites.com/textures/
Then make a graphic the size of your arena, then draw your chalk lines on it. Save and slice, and you should be good to go.
Reading Winterkill's tutorial will help you understand what the 2 pixel overlap is about and how it works. You won't lose by learning that. The rest is just up to your imagination.