Hey Leo,
I'd do what you are doing and ask people competing...they may have some skills / talents to help you make something really unique. If not an option.....if you have any companies sponsoring the events...but only giving prizes no cash...possibly sell a few of them to buy trophies. I can tell you that..trophies, if done right, can make an impact. We do HUGE trophies for our overall awards along with "prize giveaways" and it is such a joy to see kids & adults light up when they get one. (later to try to figure out to get it home can be even more funny). I'd seen this in motocross events....and it works on the wake side. Sorry this might not be the easy answer...but just my opinion.
Bill @ Performance
Gravel Tour