Does anyone wear cosmetic (non-prescription) contact lenses?

I have dark brown eyes and, all my life, wondered what it would be like to have blue eyes! So, when they came out with cosmetic lenses, I was thrilled! I have had regular blue, sapphire blue, blue-green, gray, amethyst, and honey brown lenses! But, here's my issue: does anyone else have trouble with them "popping" out? It seems like my eyes must get really dry and they lenses starts moving around and even ends up falling out of my eye! I do use eyedrops and try closing my eyes to get them to get back in place. Do I have some kind of condition causing me to have dry eyes or something? Or am I not putting them in right? (It took me a while to get the hang of putting them in in less than 20 tries! How many ways can they possibly go? I mean, they either fit over the middle of your eye or not) Does anyone else have/had this problem? What should I do? (I don't wear them every day and never sleep in them)