You can use a glue gun to make pretty designs on your eggs.
Just don't heat the water when dyeing them, or the glue will melt. Cold water, food colouring, and a splash of vinegar work just as well. It takes about an hour for pale colours, longer for darker (depending on how much dye you use in the pot).
Hollow eggs float, so you'll have to use a strainer or something to weigh them down and keep them under the water.
Peeling the glue off is easy and quick, just don't press hard enough to crush the eggshells.
Make sure you empty all the water out of the eggs after they are coloured, either by re-blowing them, or setting them onto dry paper towels to wick the moisture out.
Mound them in a pretty bowl or hang them on a tree with ribbon like I did last year, and celebrate resurrection.
Peace be unto you.