I saw one of these online and I thought I'd give it a try. It's a piece of cardboard cut into a circle. I didn't measure. I just cut as big of a circle as I could out of the box I had, it doesn't have to be perfect. You can make it any size. Then you just simply go around the circle using hot glue to place the eggs on the cardboard. If there is a gap at the end this is where your bow will go. ;)
Fill in the gaps with Easter grass. Dab the hot glue in, wait for it to cool a little then use a skewer, pencil or pen to help push the grass in. This will ruin the pencil or pen. Trim up the strays. Done.
It's not a kid craft but they can help hand you eggs. My little girl helped me out with the bow too. Just keep them away from the hot glue gun. I took this picture on my cell phone. Sorry for the poor quality. Click to see larger.