For art teachers the issue of glitter is always one that there is strong feelings about. I have used glitter before on several occasions, and with double classes.
Here are my tips:
1. For the little ones K-2 you can have them paint the glue on where they want it and come up to you and you shake the glitter on.
2. You can set up glitter stations in you classroom for older students with trays for catching the glitter.
3. You can make glitter glue that they paint on, buy glitter glue, or buy glitter paint. Some teachers feel that glitter can't be on serious artwork, I don't agree with this. When did kindergarten get so serious and drab?