Sounds kind of silly, but here is how it works:
You take a sheer pigmented nail polish that goes on without streaks (a "jelly polish"), apply one or two coats. Then you apply a coat of glitter. Apply another coat of the jelly polish over top.
I wanted mine to be a bit more opaque, so I used a creme polish as my first layer. I guess it's not a true jelly sandwich, but it's still pretty.
I started with two coats of my Zoya White.
For the glitter layer, I chose Claire's Scented polish in Sugar Cookie. This is from their holiday set, which I managed to get on sale. Sugar Cookie is a clear yellow tinted polish (not thick enough to be a jelly, but the yellow is strong enough to tint whatever you use as an under coat - I was not expecting this, but it turned out nicely!) with multi-coloured glitter in two different sizes.
For the top jelly layer, I used two coats of Sally Hansen Polar Bare, which is a sheer white. This toned down the yellow, making this manicure a nice creamy colour.
The scent from the glitter coat still comes through the two layers of the jelly polish and the topcoat! I couldn't imagine how strong it would be if I just left it on it's own. It smells a little sweet, which is nice.
Everyone has been comparing this to Easter eggs - I might have to do it again when easter rolls around, but instead, use pastel creme polishes as the base!