Wouldn't you love to be able to preview iPhone photo special effects before you take a picture? The status quo for photography apps like Instagram right now seem to be that you shoot the picture, and then apply an effect. Our friends at Engadget pointed out that the Holga folks have now come up with what they call the Holga iPhone Lens Filter Kit SLFT-IP4 (US$24.99 plus $5.25 shipping), which provides physical effect lens filters instea
