This year for Valentine's Day we made the teachers some Rolo pretzels with M&M's on top (the recipe is all over Pinterest and on the back of the Rolo bag, just use M&M's in stead of the nut) and I made a sign that said "I Rolo-ver with excitement because you're my teacher!"
I put them in some re-usable containers. Then after they are all eaten the teachers can use the container for whatever they want.
My printer was running out of ink, but I thought it looked neat so I just left it go.
I had the boys each sign the one for their teacher.
Here are the signs I made if you'd like to use them...