Blue - Rimmel London Aqua Cool
Lilac - OPI Done Out in Deco
White - OPI Alpine Snow
The pattern isn't very exciting and it bubbled a little, but oh well. Hopefully once I've done it a few more times I'll be able to iron out any kinks. I only did it as an accent on my thumb and ring finger because it was quicker/easier. I used a cutepolish tutorial on YouTube, which I found very helpful.
The water marble actually worked best on the thumb of my right hand:
Now that I've lost my water marbling virginity and it wasn't as much of a faff as I expected, I'm keen to try other patterns/colours. So watch this space...