You can wrap them around foam cones to make trees, or around foam wreaths like Ive done here: (grapevinedesigns.ca)
All you need are donut holes, about 40 - 50, toothpicks cut in half, a foam cone (about 12 in), optional: sprinkles, white melting chocolate, colored gel, and cupcake toppers. (thefoodiechef.com)
Once they're done, stick the pointy side into the foam cone with a little sticking out. (thefoodiechef.com)