Just because it’s a rental doesn’t mean you can’t decorate the walls. Ask if you can add some nails and hooks to hang items. If not, you can always try non-invasive hanging options like command strips. I’ve even seen command strip shelves that you can use to add small decorations along the wall! Try some of these gray living room ideas for your wall: macrame, tapestries, artwork, clocks, posters, photos, prints, and warm lighting.