Well, you can drive them, at a variety of levels from just for funsies to doing actual work at home to serious competition (there is a thing called a Combined Driving Event that is the driven equivalent of Three Day Eventing, which includes cross-country and arena work, with obstacles and some driven dressage). There are mini horse shows that include classes in halter, showmanship, jumping, costume, driving, liberty, etc. Minis are great for trick training; I know of one that is a certified therapy animal that does hospital and nursing home visits. Larger ones can be ridden by small children. In that picture I posted, Blondie had just done a unicorn-themed pony party where Syd and Betsy did the lead line pony thing and the kids got to decorate the unicorn (Blondie) in a variation of "Pony Dress-up" by putting stick-on jewels on her halter and harness and flowers in her hair (Blondie wrecked her "horn" by rubbing her face against a fence *sigh*). Basically, you can do anything with a mini that you can imagine doing with a big horse, other than riding it, of course.
