Headcase has designed an Etch A Sketch iPad case which officially licensed from the Ohio Art Company, but it is made to fit the iPad. It is roughly an inch smaller than the Etch A Sketch in length and width, and half an inch thinner. You also get cutouts for the home button and the ambient light sensor.
There are more holes around the sides and underneath you’ll discover a kickstand to make typing a little easier. Given that the white knobs on the front do nothing, taking this setup to your place of employment would be a good gag.