Short & Sweet:
* Idaho ice cream, Idaho ice cream.
* In Idaho, I ate an Idaho potato.
Challenging:
* Patty the potato picker picked potatoes in the Idaho plains.
* Two tiny toads taught two tiny turtles to twirl in Twin Falls.
Humorous:
* If you see a bear in the Boise woods, don't bother it. Just be Idaho-ly calm.
* A hundred hungry hikers hiked to the High Country in Idaho.
You can also play with the pronunciation of "Idaho" to create more tongue twisters:
* I saw a big I-dah-ho in the field.
* I went to Idaho and bought a potato, but it was so big I had to go to Idaho-ho to find a car big enough to fit it.
Have fun with it!