Not sure how far you want to go from original, but there are definitely some things you can do to change your seat. If you want to change the shape of the seat and/or just replace the foam with something different, you could cut into the stock foam and then glue new foam into place. If you want to change the shape you can pick up generic seat cover material and cut it yourself. Unlike most people, I wanted my seat a little higher and also wanted a flatter seat so I could move forward and back a bit while riding. I used a bread knife to cut down some of the stock foam and then used layers of a closed-cell camping pad to build the seat back up to where I wanted it and topped it off with an inch thick layer of soft, open-cell foam. I wrapped the whole thing up with some faux-leather I bought at JoAnnes Fabric for a few dollars. End result is a seat that may not look great, but feels a hellofalot better than stock, all for less than $30 and a few hours of labor.
