I usually buy Easter egg dying kits when they go on sale after Easter, but last year I purchased an Easter egg watercolor painting kit, instead. We decided we didn't want to paint on plain white eggs, so we used food coloring to dye them first. I had always used the dye kits before, but it turns out that it's very simple to just use regular food coloring. Here are the instructions I found:
By the way, don't bother with the purple dye instructions. It didn't turn out purple, but an ugly shade a brownish-gray.