...put up a DIY tutorial as soon as you can. Heck, make some kits for other cyclists or something.
This is a great idea -- combining community art and awareness with one fell swoop!
I'd run across those "vandalism" comments on other sites, too. How ridiculous...like ilikebikes pointed out, the oil, grease and rubber dust emanating from motor vehicles is FAR more vandalistic to our environments and well-being than colored chalk ever could!
