"I'm Tickled Pink That You're My Teacher" with cute pink gifts: nail polish, erasers, gum, chapstick, etc! --- I would change it to something like Tickled Pink That You're on My Team. But I love the idea.
Sticky Pop: Take an empty, clean pop bottle and cut a slit down one side. Stuff glue sticks and Easter grass (as filler) into the bottle. Cover up the slit by wrapping a label around the pop bottle and you have yourself a simple teacher appreciation gift.