- Edited
ah thats a mix between https://wallhaven.cc/w/mdyd1k and https://www.deviantart.com/gavinash/art/Spectrum-Wallpaper-344409895
which resulted in .. hey why cant i post imgur links? h**ps://i.imgur.com/X0wNeep.jpg
(i hope thats the one you mean. took me a while to find the links)