Abstract Curves

1) Open a black document, and select the pen tool

2) With settings like the ones below
3) Now click on the document with the pen tool and drag it until you get a line
4) Now click another area of the document and drag the pen tool, and now you should have a curved line
5) Now to use the pen tool to rollover the first point you made until a small circle appears, once here click and drag until you have your curve
6) Now you can fill the path by left clicking with the pen tool, and then delete the outline by left clicking and pressing delete path, here is my result
7) To get the colors i just used color and gradient overlays located in the layers tab