I got this idea from Shayna. It's super easy, and helps with a number of skills -- fine motor development, language, object permanence, reasoning. Cut out easily recognizable objects from magazines and laminate them. Then hide them in an old wipes container. I put in some extra photos of her too as a fun surprise.
Ellie loved digging around and finding pictures, especially of babies and food -- and herself!
As she's gotten older, we've started practicing identifying the objects and talking about similar items (like fork and spoon). I also cut out sets of lowercase and capital letters. Yeah, it's a bit early, but it can't hurt, right?
Shayna has a much better post about this activity here.