I'm also switching from my normal (and now overused) background pattern of water to neurons.
I like neurons. Metaphorically they work as stories about people connecting, and the random patterns of life. I also like how they look like coffee spills.
Here is a cool detail.
Maybe you can see the two layers.
1. painted canvas
2. texta'd tulle
Where they overlay you get a bold black. Nice.
Ok, next bit shows my nasty stapling on the back, but neat folding ...