so, you asked: how do I find such cool backgrounds aka images. Ok, it really depends on what you search. I literally (for the collage you commented on which had an image of a window) just searched up "tumblr window" on Google Search and boom, I got the image I wanted. Then, I screenshotted it to my photo album, opened PC, cropped the image 3x4 and set it as my background and just began to create ✨

oh thank you!