I also picked up marbles and a towel (scrunching it up) using my toes-- but not both at the same time!
LATER, I stood about a foot or two away from a wall and leaned forward so I was standing on my toes. The main thing though was the bending back and forth and walking (wearing gym shoes, not surgical shoes that don't allow the toes to bend). The ultimate goal is to regain the same range of motion you had before the surgery. Shortly before I had my surgery, I met a young woman at work who had had a bunionectomy on one foot and hadn't done PT or much exercise afterward. She said that she really regretted it; that her toe was stiff and she didn't think it was ever going to get better-- That influenced my determination to faithfully do the exercises; that and my own doctor's advice, of course.