I find wood grain so soothing that I often draw vast hardwood floors just so I can create that organic, yet linear, pattern.
Do you really need an excuse to draw a smiling poop on your thumbnail?
Not only do I color coordinate, sometimes I match the patterns in my clothes, too!
I experienced a lightbulb moment while shopping the aisles of my local Staples. And no, I wasn't shopping for lightbulbs.