Easter Egg Maker 2015 now for Customizer, with a few limitations. You are limited to smaller images and lower resolution meshes, and a few less options than with the stand alone version here: http://www.thingiverse.com/thing:719877, but otherwise it works the same, with the convenience of the Customizer user interface.
The image you choose controls displacement of the egg surface instead of color. For best results, you need to generate a depth map image or convert an image using an image editor. Usually high contrast images that have been blurred in an image editor will work. reasonably well. White pixels are displaced by the height you choose and black pixels are not displaced at all; grey pixels are displaced proportionally somewhere between these two extremes.
I've included some example depth maps that I either made or found in a hurry on Google images, so they probably are not optimal, but will show you how it works.
Please post some good Easter Eggs for us!