I've been wanting to do finger print nails for a while now, so that is what I did instead of something Valentine's Day themed because I am horrible at ideas for holiday-themed nails.
The base is two coats of Sally Hansen Wet Cement and one coat of Love and Beauty Cream on top in order to make it a bit lighter. The finger prints are done with black and white acrylic paint. To avoid globs of paint of my nails instead of finger prints I took a small paintbrush and painted the paint onto my fingers (I used my thumb and index finger). I then rolled my finger over my nail (kind of like stamping). Cleanup was really easy because acrylic paint washed off with soap and water and a tiny bit of scrubbing, just make sure you put a top coat over the paint on you nails!
Fun Fact: I have actually been finger-printed before. The story behind it isn't really that exciting; I work for my school and this past year the district mandated that everyone employed by the school had to be finger printed. There was no ink involved, they had this scanner thing that they roll all of your fingers over. When I was waiting for them to get the machine ready I had to sit on a bench with handcuffs attached to it, so that was fun.