Interesting; it's probably an A/B test, since I'm not given that option. At the bottom left corner, my screen says, "Change background image." EDIT: Actually,

Interesting; it's probably an A/B test, since I'm not given that option. At the bottom left corner, my screen says, "Change background image." EDIT: Actually, I selected a background, and then I was given the option to "Remove background image." Unfortunately, this just reset my background image to whatever Google had chosen for me.