Look in the yellow pages under Signs - Equipment and Supplies. I purchased 3M Scotchlite for about $5/sq ft in red, yellow, blue, white and green. This is the same material as the rolls. Has the peel off back. I cut pieces to fit wherever I want it. Strips on a messenger bag. Narrow strips on front fork and head tube. Large shape on my rear light bracket. Even cut a piece of the blue to fit the lower rear part of my helmet. Since the blue is a nearly perfect match it is invisible during the day but shows up at night in headlights.
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If it ain't broke, mess with it anyway!