The final product:Not super attractive, but it appears to work. I think the rear fender worked out pretty well, but I think the front looks slightly derpy. We'll see how it holds up. Here's where I started - cheap flexible ductwork:Next, cut it in half:Form around the tire:Add duct tape to give it a more permanent shape:Initial fitting:Spray paint with approximately the correct color:Attach rear with zip ties and a screw:Rear is done:Rig up dowels and duct tape to front fender:Assemble the final product:The initial ride around my back yard in the snow went well. There wasn't any rubbing and the fenders didn't seem flimsy. I'll report back on how they hold up on longer rides when I get a chance.I think that with better front attachments this could be a great material. It's flexible, so you can make it fit just about any setup. It's also cheap and lightweight.On the downside, it may make your bike look a little "special".