I think foil transfer is a ton of fun! I picked up this really cool foil of printed tiger fur with sparkly holographic white zones. This was a bit of an unplanned experiment of whatever sounded good at the time, but I like it!
I put a base color of Wet n Wild Black Creme down, since I find it hard to get 100% coverage on foils without some creasing and black hides that really well with this pattern. And really, I didn't have as much trouble as I was expecting!
For my ring accent nail, I thought I would experiment with foiling an oval metal stud. Trying to foil over just the metal did not work, so I painted over it with more black polish before applying the foil. That still looked a little bare, so I framed it in tiny metal beads. I then decided to go all-out and added some holographic silver diamond glitter and then applied more foil across the tip. Woo!