I came up with some preliminary designs:
#1 A mild variation on the first t-shirt design.
#2 A variant that obviously features the Yamaha logo
(Sorry about the size, it was either thumbnail or way too big. You can click on it for the full-sized image)
#3 A more complicated variation on #2 that features both the Yamaha and FZR logos, and would go best with the most different colors of jackets/leathers
(Don't laugh at the graphics quality; all I had to use was creative use of Microsoft Word, MS Paint, and the "print screen" button)
I'm talking with a couple of places that make patches, and so far the estimate is somewhere in the $5-10 per patch shipped, though I'll get a precise price as the time gets closer to place the order. I'll be trying to keep costs to a bare minimum on these, and won't be trying to make a profit, but at the same time I can't sell them at a loss either.
Just leave me some feedback on which designs you like/dislike and why, and feel free to design your own and PM or e-mail them to me, and I'll review their doability, upload and post them.