Yes, eggshells - and working embroidery on real eggshells is a super-hot trend!
Check out the tutorial at Make-Handmade for creating two half-shell embroidered eggs. It’s easy to follow, and you can get two ornaments out of a single egg.
The ornament to the left is embroidered in silk and satin ribbon, and the eggshell to the right is embroidered in basic embroidery stitches and can be worked in your favorite embroidery threads, and is accented with glass seed beads for an elegant touch.
The talented folks over at Design Sponge have also posted a detailed tutorial showing just how easy it is to prepare and stitch on real egg shells.
Their eggs feature simple designs that would be easy to reporoduce, and I love how they’ve used a combination of white and brown eggs in their sample project.
The emtpy egg shells can be dyed using commercial dyes if you prefer colored eggs, or locate eggs laid by Araucanas which lay blue eggs or Japanese Bantam which often lay pink eggs. These can often be found at your local Farmer’s Market.
If you can find larger duck eggs or huge ostrich eggs, you could create a basket full of unique eggs of different sizes!