This is a project I started seven years ago, back in 2007. I sketched out these eggs and cleaned them up and edited them in Photoshop. (The first two images of each egg shows this process).
Then two years ago when I was honing my Illustrator skills I made them into vector images. (Image 3 of each egg).
After the vectors were made I pulled them into Photoshop again and added color. (Image 4 of each egg).