This challenge has been going on for well over a year now, but the idea is there are three colours pre-picked and you find those three colours in your stash and use them in some kind of nail art. For the blue I used Max Factor's Odyssey Blue, the yellow Collection 2000's Sorbet and the red is ELF's Red Velvet.
Max Factor - Odyssey Blue
Collection 2000 - Sorbet
ELF - Red Velvet
I used Jacava Vanilla Slice as the base.