Oh yes, incredibly creative title. Well, at least you know exactely what I have for you today.
These didn't turn out the way I expected, the blue is different on each hand and the size of the print too. I'll be smarter next time.
I made a pictorial for this:
I think it speaks for itself, you paint barely visible guide lines, fill them in and add those white lines as shown.
What I used:
Rimmel 367 Bare Necessities (nude base)
NYC Turbo Dry top coat
Miss Sporty Check Matte (matte top coat)
and these two brushes:
Just so you know, I did these while ago, like in October? So I really don't know what to say about them now. :D