I find these Pen Paintings by Daniel Eatock really interesting. As far as I can tell they were made by balancing a sheet of paper on the nibs of different markers. The resulting work is a pretty psychedelic fusion of kaleidoscopic pattern and trippy blurred colors.
A former graphic designer and now an artist; Eatock seems hard to pin down. His work is a mix or sculpture, print, production and writing. His practice is shaped by investigation and invention, with often whimsical or subversive results. In the past his diverse output has covered everything from making the identity for Channel 4’s Big Brother, to co-developing the Indexhibit web Content Managemnet System.
You can view a huge selection of his projects here.