It's very very simple to get a nail look like this, even without the swirls.
All you have to do is paint half of your nail one color with as straight of a line as possible, then once it's dry, paint the other side. If you have a sloppy line, take a Sharpie or a nail pen and draw a line on top of the middle of the colors to make it look polished.
Good luck! I hope this gives you a fun, new nail idea. :)