Simply rocking horse: Cut the tire into half and place a plank on it, add a kind of stick that forms a T in the front and there you have it a basic rocking horse. Do ensure that it is safe before you let kids use it.
A swing: This idea is an old one but a very good one given that tires give you plenty of space to perch within and is not that heavy so that it allows you to swing when tied securely on a tree branch.
Tire minion planters: The concept of a minion is composed in such a way that the use of tires seems like a no brainer and then all you need to do is add the right coloring to the exterior of the tires. You can enter the hole in the tire to plant the kind of plants that you like.
Wishing well: Use the tires stacked one on top of the other to make a nice well and then add a structure on top to house the pulley and there you have a nice well right in your backyard.
Snowmen: It is simple enough to use tires to make simple and round snowmen that you can paint white on the exterior and embellish accordingly.
The fact is tires are so flexible and have such a sturdy structure that you can find several uses for them once you get started. You can always look at the images that accompany this article in order to come up with more ideas in case you want to do some more inspiring and interesting art with tires. Not only are they fun to work with, they are easy and very useful too.