Alright, it looks really cool. It just wasn't how I pictured it.
The nail polish I kept using wasn't exactly great for water marbling. It kept separating and let a lot of air pockets in. It still did towards the end, but I had given up by that point and let the bubbles stay.
The look I was going for was to make spider webs out of the marble. You can kind of see it because of the shapes I made, but it didn't turn out well at all according to what was in my head. The two closest are my middle and pointer finger.
For this design, I used Maybelline Color Show Onyx Rush for the base, and then used Essie Marshmallow (Fitting, right? :P), and Sinful Colors Secret Admirer.
Maybe I'll have better luck with my next attempt.
You can find a list of all the challenges here.