I present to you my rainbow gradient nails. Very simple, very pretty, and subtly stunning (in my opinion). Definitely the best gradient I've done so far! Although you can't really see the pink on the other side of my thumb nail, the blend between the pink and orange was REALLY seamless.
Pink - Sally Hansen Xtreme Wear #240 Twisted Pink
Orange - Sally Hansen Xtreme Wear #150 Sun Kissed
Yellow - Sally Hansen Insta-Dri #250 Lightening
Green - Sally Hansen Xtreme Wear #110 Green With Envy
Blue - Sally Hansen Xtreme Wear #130 Blue Me Away!
Purple - Sally Hansen Hard as Nails #370 No Hard Feelings