Hi K..
If a group of kids are "graduating" let me tell you what I organized for the kids I was a Nanny for preschool teacher.
At the end of the year, I colllected about $10 from each parent, then took the money and bought a gift certificate to our local mall. The certificate ended up being $120-150!
The teacher LOVED it!! Many tears from all of us. = )
I thought of this, because I was a preschool teacher myself for many years, and while we love gifts from our kids, we often get so many, we cannot keep them.
With the gift certificate the teacher could have a meal with her family or by something fun for her, and think of us.
Good luck.
R. Magby