What are some holiday gift suggestions for my daughter's pre-school teachers?

My daughter, who is 3½, goes to pre-school two days per week. I need some gift suggestions for the teachers. Two additional questions:

Does the fact that she goes to the school only 2 days as opposed to full time make a difference in the gift or amount spent on gift?

Does the teacher’s assistant get the same gift as the teacher? I’m thinking yes to this question but want some opinions.