All the pictures of these mini Easter, or spring, terrariums are really cute so be sure to take a look. And, since, the only plant is an air plant, you won't have to worry about keeping it alive! Find all the information at My Own Ideas.
I think these origami bunny boxes at Origami Spirit are so cute and a great way to decorate for spring or Easter. Origami can always be a little tricky so you may want to practice a few times before showing the kids. This link is a video tutorial which is really helpful too.