Family tree wall: Self-stick tree decals are available in many designs online. Scan old photos (It's quick 'n easy with iPhone or iPad + Pic Scanner app); print and frame. Download the app free at the App Store.
David Hockney - This mural is made up of photographs. Even though the photos don't go together they still look really effective together. As I do photography I could take the photos, put them together and paint them.