I made up some green flubber, gak, or slime with equal parts Elmer's glue and liquid starch (found with laundry detergent). No matter what you call it, it's a polymer that really does look (and kind of feel) like eggs! I mixed it together with my hands, mostly, then added green liquid food coloring. I cut circles out of green foam for the yolks.
E enjoyed this squishy, squirmy sensory material. She used plastic safety scissors, a fork and plate, and a rolling pin in her play.
D can't join in this sensory play yet, but he celebrated by wearing his green eggs and ham shirt. He doesn't seem TOO disappointed.