Any hard vegetable/fruit could be spiralized, if you wanted.
I've had spiralized carrots and beets numerous times. Actually, had spiralized beet in an otherwise ordinary salad yesterday and it was delicious!
Here is a recipe (not the one from last night...): Beet & Carrot Salad
It calls for julienned veggies, but spiralized is what I usually do! Much more fun!!!
Here's a soup recipe that calls for spiralized veggies: Asian Noodle Soup