Poppies Decal by Elephannie ($16)

If you live in a rental and don't have the freedom to paint the walls, these wall decals by etsy's Elephannie are an inexpensive option to livening up a boring wall. I'd use this Poppies Decal above my bed as a faux headboard. It's a vinyl sticker that's easy to apply (and remove) and comes in over 20 colors. If this appears sold out, just browse her collection to find a newer posting.