If I am unsure of which eye shadows I should use for a make-up, I usually apply a little primer on the hand / arm and put the shades next to each other.
Then you get a good overview of how the colors get together on the eyelid, and it is easier to decide!
This is also a good trick if you have a lack of inspiration, go crazy with different color combinations on the arm first and you will surely get an idea for an eye make-up :)
Color test for today's make-up, which is available at Modern Mom now.
I can smudge as much as I want on my left hand / arm, then I forget about it and leave home haha.
But it's a bit charming maybe, I hope :)