Instructables user “smching” has written full instructions on setting up your Pi and a screen as a digital sign displaying exchange rate information.Read it here.
Sometimes you see a project and you just have to feature it. Using a Pi, a PiTFT and a 3D printer, along with a few other bits and pieces, Noe Ruiz has created the PiGRRL: a clone of the Gameboy with a Pi inside. Really pretty stuff! Read all about it here