I'm moderately obsessed with the color purple, especially rich dark purples. For this manicure I used Nabi polish in Purple Glitter. It is highly pigmented and nice and sparkly. I added a gradient of some mystery polishes in blue and green on top with Bundle Monster plate BM21.
To stamp the gradient, I dotted the blue and green on the side of the image, and scraped two or three times, overlapping the colors as I scraped. The difference between blue and green was hardly noticeable on top of the purple, but I'm definitely going to make another attempt at gradient stamping with some more opaque polishes.
Here you can kind of see the green on top and blue on bottom:
And from afar: