I too have done the whole blue eyeshadow thing. But I have a really fair complexion, and done right, this sort of makeup actually looks really good on me. But my biggest beauty blunder would have to be back in 7th grade. It was around the Christmas season so I was feeling extra cheerful. Then I ended up wearing these crazy plaid red pants I had with a pretty blue christmas sweater. I looked very festive. To make matters worse I ended up making myself look like a crack whore with the makeup that I ended up wearing. When I was younger I went through a red lipstick faze. My mom, knowing that I looked really stupid, let me do what I wanted to do and experiment, so I wore my usual red lipstick and then because I was feeling so festive I decided to wear some really crazy looking navy blue eyeshadow as well. I looked so bright. I thought I looked fabulous until one of my friends came and asked me who taught me how to do my makeup. And then she told me that I looked like a hooker.
I would really like to forget this whole story, but looking back on it now it's kind of funny!