What are some graduation gift ideas for a future teacher?

I am not a very creative person when it comes to gifts, so I am depending on my fellow jellies for some good ideas!

My wife of 4 years is graduating in May with an early childhood development degree (she wants to teach the youngsters how to grow up and be cool). So, what would be a great present to give from husband to future-teacher wife?

It must be no more than $100. It can be purchased online, in store or even be handmade. Something personalized and creative would be great.

What would make her say “Wow! That is sooo wonderful!!!” and then make her love me more, of course.