Backgrounds and textures - paint - painting - abstract - wallpaper - beige - neutral colors
For those who seek the secret knowledge, here are some stats
PHOTO TAKEN WITH:
MODEL: Canon EOS 5D Mark IV
APERTURE: f/7.1
LENS: 70 mm
EXPOSURE: 1/200 s
ISO: 400
Original size: 4480 x 6720 px