Something about a pink and grey combo screams girly to me. And paired with a little mouse makes it extra cute but even if you cant do the mouse i highly recommend the pink with grey tips.
Very simple to do.
Paint your nails a light pink.
Wait for them to fully dry then i just free handed a grey tip on.
Draw the little mouse and appy some clear coat.
Isnt he so cute.
You can find lots more nail art here.