I've tried doing a gradient a couple of times, but was never happy with the result. Then I came across this tutorial the other day and had an 'aha' moment. This technique works really well! I've finally done a gradient I'm happy with. It's not perfect, I'd like to try it with a finer sponge. Here it is!
SallyHansen double duty, as a base coat.
Rimmel 60 seconds in 730 Silver bullet, two coats.
No7 Stay Perfect in Foxglove 80, two coats on accent nail.
Sally Hansen Insta-dri top coat.