It's probably safe to eat them -- We've taken them on camping trips. But the Food Safety guidelines from Canada Health have changed on this:
Easter eggs: Decorating hard-boiled eggs at Easter is a popular activity. Decorated eggs that have been left out on display are not safe to eat. If you want to eat the eggs you decorate you should hard boil them thoroughly and then cool them (either by immersing them in cold tap water or on the counter until they have reached room temperature) before placing them in the fridge. Use a non-toxic colouring dye on eggs. Be sure that eggs are kept cold before and after dyeing. Between dyeing and cooling, they should be out of the refrigerator for no more than two hours in total. Coloured eggs can be stored in a covered container in the refrigerator for up to one week. The advice in your area might be different.
You colour the eggs? Interesting -- here we buy the plastic refillable eggs (for candy and non-candy treats) and the individually foil-wrapped chocolate eggs.
I didn't forget to hide the eggs, but when I was filling them last night I realized I had forgotten to buy non-candy items. Frantically stole a few from DD's room and filled 2 (she noticed there weren't any hairclips when she was checking out her finds), ran out to the pharmacy this am to get more and hid them while she was playing with her new toys. Luckily she took a break on the egg hunt to watch her new HSM3.