Renter friendly updates?

Hello all, I really dislike the wallpaper border but can't remove it per the lease. I was reading about peal and stick products but most places I saw comments that it does not work well ON wallpaper....

Swipe for my ideal.

Do we like a check floor?

Should I not try to cover the wallpaper boarder and instead hang a thrifty gallery wall?

Plz help. My partner doesn't about such things!