Cost:
minimal

Description:
Each petal will be a picture of 1 child. The center will be the teacher's photo.

Preparation:
Collect snapshots of each child and 1 of the teacher.
Cut out petals on either thick, poster board. At the end of each petal, use a glue gun to put a child's picture (Each petal will be 1 child). In the center, use the teachers picture, cut into a circle. Use a glue gun to assemble it all to a plate (Thick Dixie or even a lucite one). Glue gun it to a bamboo stick or other approriate kind of stick for the stem. This flower won't wilt, and the teacher will have it for years to come.

Other comments or suggestions:
There are alot of ways to do this. Get creative. I happen to be a photographer by hobby, so I've had pictures from all the parties, and picked out the best one of each student.