Sometimes I'm scared to play with color shadows...and I thought blue was too 80s and totally out of the question. But I tried some purples, pinks, even blues recently and really like how it makes my eyes pop. And did you know you can wear shadow under your eyes? It looks great and doesn't smudge like liner. I found this great video from mark.girl that will help you apply.
Let me know if you try it or have other tips!