This is a photo that I took on my holiday to San Francisco, it's a vertical panorama taken on my 1020 - personally the black and white + the portrait layout works well on my tiles.
I've found that some paintings work, some don't...even the busiest of images has made a cool background for me (a shot of a box of crayons), and some of the plainest 3d images have failed.
I find myself using 3d sphere images most, but I try to switch things up to keep everything fresh.
Since we are discussing wallpapers...can someone help me with the HTC 8X and 8S wallpapers..have practically scoured the whole World Wide Web.. Couldn't find it..