I've done these on a much larger scale then created Easter egg baskets by cutting a circle out. Trim edge with lace or ribbon (I used hot glue to hold it on). Take a paper towels role & cut into about 2" pieces for the base (paint, glitter or wrap the base). Fill with Easter grass and goodies. Done! :) ... I've also turn the egg shape on it's side and made a carriage to hold baby items.
I highly recommend making an “Easter Egg Bath” for your little one–our kids had a blast! I think the highlight was making waves and watching the eggs bounce all around (using the larger eggshell halves to pour water, a close second).