Something I used to do a lot, and would like to get back into, is rip textures, patterns and backgrounds from video games and use them as wallpapers. My penchant for repeating backgrounds lends itself well to doing this, as many video game menus have subtle patterns or borders that I personally find really freaking cute.
Many of these are from sprite sheets downloaded from The Spriter's Resource and then cropped out, while others I have outright ripped myself using emulators or other tools. Some of them I cropped myself, but I cropped them from sprite sheets nabbed from TSR. Frankly, I can't remember which ones are which sometimes, so I'm just going to give all the credit to them, and only specify that something is my own rip when I know it's mine. *sweats* Many of these have weird dimensions, but they tile well enough, I promise. You are welcome to modify these as you see fit - crop them more, change the colors, etc - but I would appreciate some credit either way.
Kirby
Super Mario RPG (TSR)
Mario Parties
Misc games
Tamagotchi L.I.F.E./Angel Backgrounds and wallpapers (external link)
Tamagotchi L.I.F.E. was a short-lived brand of Tamagotchi products from back in 2013 and 2014, and with it came a couple of apps based on the original Tamagotchi and the Angel. I played them for a bit and always really liked the graphics used in them, so recently I tried to find somewhere to download them...but I couldn't find any! So I decided to extract the .apk myself, something I really like to do anyway.
Because of how many there are, I'm hosting a lot of them externally here; feel free to go download them all! There's also another folder within that one containing edits I did to some of these backgronds, which you're also welcome to use. These are mostly phone wallpapers, but they're all easily tile-able, and I frequently use some for desktop wallpapers too.
The portrait-oriented ones are resized for page space, but they will be 256x512 when you save them.