What would be cool (and I haven't done it yet to my bike) would be to design some vinyl designs for the fender and down the fork. Either some swirls, or floral (but not kiddie) or any other design and adhere them to it. Something that had a center and flowed out from there to the edges of the fenders. For the fork, you'd need something that flowed from the top down.

I have an industrial cutter but I haven't gotten brave enough to try it out on a bike. I'd like butterflies on mine with flourishes but sizing and finding the right butterfly has been hard as everything is kiddie or overdone. It might just be better to keep it simple in turquoise blue racing stripes.

I have plans to do my Sirrus frame in the color of my tires (turquoise blue) and silver/gray in either a matte or a pearlized vinyl if it exists. I just need to find the right colors and matching up vinyl online is hard. I just don't know if it would look tacky and homemade if I did.