I searched a little further and the inside looks like a wasp gall for sure. I've been a nature wanderer here my whole life and have never seen this type. Thanks for the idea, I'll keep my eye on them.
We have lots of gall wasps and the only ones I've seen are a light brown. Great idea, it's kinda similar. These are perfectly round, too, which is not what I commonly see here.
That's fantastic and is a great idea for a way to get through school. I paid my way also, and got out with only a couple hundred in debt. Good for you!