I LOVE wall decals - so simple to add to a wall and so cool - Here is an example from WallWritten.com).
Disney Finds - Ohana all weather vinyl decal
Remember Who You Are Lion King-Simba-Vinyl Decal-Iron On-Car Decal-Silhouette-Mac Book-Sticker-Yeti-Disney- by KGDESIGNS16 on Etsy
Verre à vin Decal Set Kiss et moustache lèvres par TheManicMoose
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Would be cute in Gunner's John Deere room in the new house! Tractors Trucks and Toys Nothing Quite Like by greatwallsoffire, $38.95
Kids Room Tour - Apartment Therapy Main
ChooChoo Boys Vinyl Train Wall Decals set by blankcanvasdesigns, $9.50
This is such an awesome window display. The repetition of the chairs (but in different colours) is cool and abstract.
Birch Tree with Owl Wall Decal