This is my first try at making a texture pack. If this goes well I might do a Final Fantasy 7 Remake one. I do have a Wordpad file containing the websites where I collected the pictures, but ill also copy/paste the list here too. Hope I did everything right! If not, let me know.

"alban" www.vecteezy.com/free-vector/retro-pattern
"aztec" wallpapersafari.com/w/Fy3c0R
"aztec2" www.freecreatives.com/patterns/retro-patterns.html
"bomb" www.uidownload.com/free-vectors/free-retro-abstract-seamless-pattern-232859
"burning_skull" pastdaily.com/1950s-space-art-resize-1/
"bust" sites.google.com/site/blueglowrpg/home
"courbet" www.photo12.com/fr/image/umg20a51_294
"creebet" www.desktopbackground.org/wallpaper/nintendo-game-console-hd-heavenly-wallpapers-free-hd-wallpapers-672078
"donkey_kong" www.pinterest.com/pin/755619643712535375/
"fighters" www.pinterest.com/pin/687995280569668876/
"graham" www.arizonaskiesmeteorites.com/Original-Illustration-Art/Vintage-Sci-Fi-Rocket-Space-Art/
"kebab" www.uidownload.com/en/vector-mngkb
"match" www.uidownload.com/en/vector-jpowi
"pigscene" www.pinterest.com/pin/44965696267217765/
"plant" depositphotos.com/12701374/stock-illustration-seamless-abstract-retro-pattern-stylish.html
"pointer" newspaceglobal.com/gallery-1950s-space-art/
"pool" www.pinterest.com/pin/556264991475468596/
"sea" steemit.com/art/@serkorkin/space-art-retro-fururism-set-1-man-in-space-1965
"skeleton" www.reddit.com/r/RetroFuturism/comments/64xxu7/future_life_1980s/
"skull_and_roses" www.pinterest.com/pin/345651340156473806/
"stage" www.dreamstime.com/old-retro-background-rays-explosion-imitation-vintage-starburst-pattern-bristle-texture-circus-style-flat-vector-image145564740
"sunset" phpography.com/retro.html#gal_post_3656_retro-wallpaper-1.jpg
"void" www.pinterest.ru/pin/322007442106197243/
"wanderer" twitter.com/humanoidhistory/status/1169938702442930176
"wasteland" www.pinterest.com/pin/246783254553812166/
"wither" www.trendhunter.com/trends/retro-future-space-illustrations-visions-of-the-future-from-the-past

UPDATE
Revised the pack to work in Minecraft version 1.19.3