Check out this app from the makers of ‘Sketch Me!’, it looks excellent. The Graffiti Me! effect can be applied to any image. Best results are obtained by using a picture with good contrast. This app retails for $0.99/£0.69 and you can download it here. Features   – Supports Facebook, Twitter and e-mail so you can easily share your graffiti with your friends, as well as save them to your iPhone. – Features an easy-to-use interface. You can use your finger to move an image around on the screen to find its best position. You can also zoom in and out through the pinch gesture. – Auto Paint mode (as…