I love my frixion pens! I did this very thing this morning. I found a circular feather design that I want to do on my "airport" purse, but the design was smaller than I needed, so I tried my hand at drawing it out. It turned out very nice, nicely especially since I could erase my boo-boos.
Tip: That little Rubber 'eraser' thing on the end creates enough heat from friction to erase small areas, no need to use big old iron.