More like a mass of class 
The reason why I’m suggesting having more wallpapers with the distro is a simple one - when I go through the ‘show your artwork’ page I see a gold mine of creative genius. Some distros have an occasional great piece of artwork, Garuda has got hundreds of pieces. 
It strikes me as a crying shame that the wallpapers aren’t getting the attention they deserve, this is why I’m suggesting using JPEG XL to compress the png images and bundle them with the distro.
I currently have some time to kill so I’d be happy to go through the images, compress a load of them into JPEG XL files, and forward them to you. You can then decide which ones should be bundled with the distro, and even if a lot are chosen there’s little chance of them increasing the iso size - 100 wallpapers should only require ~10MB 
Good idea.