We've all visited the paint isle at the local hardware and DIY stores. They are filled with hundreds of colors. The next time you are there pick out several springtime colors.
Then, cut each in half and on the backside trace an egg pattern and cut out. Try to make sure you trace your pattern so that when you cut out the egg you leave out the "color name" on the front side. Then poke two small holes at the top of the "egg" and run a small string, twine or ribbon through to create a string of eggs.