Yep. When I was in 4H I didn't have a quarter horse. Everyone, and I mean every other person had a nice quarter horse- I had my grandpa's old belgian plow mare. I rode her in an Aussie saddle because that was the only saddle that fit her. I did barrels, trail, and some other fun games- rescue race and pole bending were fun for us. She did fine! I got laughed at, probably why I am so not interested in showing NOW, but it was fun at the time.
Spent a whole hour today laying in a pasture, waiting for a sparkling vampire to show up. Alas, I woke up and looked over, only to find a mound of horse crap. Sigh.