I buy the black duct tape and put a couple of wraps around my seatpost (also black).
Has saved me on too many occasions to mention.
Also, if desperate for a tire boot, a couple green leaves work.
I've also heard of people puncturing the tube and their spares and filling the tire with leaves and limping home!
L8R
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"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming, "WOW, What a Ride!" - unknown
"Your Bike Sucks" - Sky Yaeger