You know those people who are really inspired by their dogs 'cause their dogs are the best and they love them so? Yeah, that's me now. I took what I've learned so far about shapes and rectangular backgrounds and grouping and created an actual good-looking thing!
Then I wanted to put Geometric Wally in a box to make an art print:
But he looked weird, just floating there in the middle of this empty plane, so I shifted him a little and got this, which I think looks much more interesting:
And hey, what do you know? Turns out putting of things off-center creates visual tension and interest - there's even something called Arnheim's Structural Net which purports that the eye is naturally drawn to certain areas of the canvas, including right where Wally sits now. Another graphic design theory stumbled upon!