Okay, it is at this time that I must ask about the process of making these graphics. I'm sure that if the software/hardware/materials are available, many of us could take advantage of this for lots of projects, not limited to M/Cs.
The process:
I will decide on what I want the graphic to look like
I will bring it to my graphic designer friend
She uses illustrator to create vector file (a high resolution graphic 300dpi)
She sends the high resolution graphic to a place that cuts vinyl (probably a sign shop)
The sign shop will cut the vinyl according to the graphic the designer sends
We get the cut vinyl back and stick it on the bike
I will shoot some clear over the graphic design
Then I will take some pictures and post them up here when we are done
Secret revealed. Get with your local sign shop & see if they have any graphic designers. Better yet, check around your town & see if there are any freelance graphic designers who can create the graphic you need. I eliminate this cost because my graphic designer is my gf.