PicSketch is a US$1.99 universal app that takes any photo on your iOS device and turns it into an image that looks like it was sketched. Using the app is a two-click operation. One click lets you select the style of sketch, another click lets you select a color or mono background.
You can explore several of the options, and when satisfied either save the photo or share it. The app gives you 22 pencil sketch styles, 5 sketch effects like B&W and color, and 18 different retro-looking sketch backgrounds.
The app works as advertised, but I never felt the photo itself had the true look of a sketch. Instead, it looks like a photograph that's surrounded by brush strokes. Meanwhile, significantly more expensive applications like Photoshop