This nail design was inspired by pretty pool water. Like when it's all reflecty and pretty and has swirly lines on it, you know? If not then just pretend I was inspired by water, and just water :P
First start off with white nails
Then get a makeup sponge. I like to get off the pointy bits to get a round (ish) edge
Then dip the corner of the sponge with a bit of any blue/green/teal/turquoise/mint/pool-water colour you have
Then dab it into your nails. This is where it's kind of tricky. You don't want to cover all your nail with the pool-water colour, you want to leave some bits white. But you also don't want to have a smooth gradual colour change. You want it a bit chunky, but not too chunky. So some parts white, some parts light pool-colour and have some parts dark pool-colour. But you want these different shades to blend. It's sounds complicated, but it's not really
Then using a white striper, draw squiggly lines. Try to have some lines thick, some thin, some opaque and some somewhat translucent (do as I say, not as I do)
Add a top coat and sparkly coat if desired. This will really help the colours blend and make it look much much better!
Then there you have it! Pretty pool water inspired nails :)