Don't get sucked into buying the Easter egg dye kits from the supermarket like I did. You get a couple of teeny bottles of dye, a white crayon, a piece of twisted wire and instructions for $6, all of which you could find at home already and on the internet. Oh well, lesson learned and we did have fun.
For the dye mix we used a couple of teaspoons of dye + 2 tablespoons of white vinegar + warm water to fill the tea cup.
The best ones were the crayon ones. The rubber bands were just a bit too fiddly to get on for little fingers and the dye seemed to get underneath them anyway. Maybe wider bands would work better but I was working with what I had. The crayon was easy and even just the scribbled on ones looked great.
We had a lot of fun and made a lot of mess and will definitely be doing this again next year minus the supermarket kit of course.