Charlotte Mann's trompe l'oeil style walls and floors are an inspiration.
Charlotte is a British artist known for her wall drawings and drawn room installations. These densely detailed 1:1 scale drawings of rooms in rooms are invariably made with thick black marker pen on a white ground. The images above are from work she did in Milan, Italy at the Fontana shop. Her perspective is amazing.
My cousin Jasmine sent me a link for the artist Escif who apparently does some really eye-catching street paintings. It's pretty difficult to find too much information, but more can be found on Escif's Flickr and here too.