Thanks for the ideas!
Here were some other ideas I came up with, but didn't use:
homemade ornament made with mini horseshoe and ribbon
gloves and handwarmers
hat and gloves
mini 1st aid kit with items from dollar store (for people, with bandaids, neosporin, sample aspirin, etc.)
bag of apples or carrots
The party was last night, and I had 4 kids go (2 of my own, 2 tag-alongs!) and thought I'd let you know what we took and what others brought.
My 2 kids took really nice hooofpicks with silver accents on the handle (normally $9, on sale for $5 at feed/tack store)
My tag-alongs bought grain scoops for $3.99 and filled them with homemade horse cookies. (The pink scoop was waaaaaay more popular than the red one. Maybe because most of the kids there were under 12 years old. Although some of the older girls really liked it too!)
Some other gifts I saw were:
horse book (like Boxcar Children type, younger readers, maybe 7-11 years old)
sponge and enormous bag of horse treats
If you care, here's what I put into the horse treats. Sorry I didn't measure, so everything's a guess!
3 c. oatmeal
2 finely chopped apples
2 finely chopped carrots
3/4 c. vegetable oil
1/2 c. molasses
1/2 c. flour
Mix together and scoop into mini muffin pan cups. Bake at 350 for 15-20 minutes til "done".
Normally I don't peel my carrots and I just chop whole apples including the core, but I took the time this time. And a good thing too, since a lady took a bite of one!