Hong Kong-based Touch Inspiration's Utile 2 for iPad 2 ($55) is pretty unique among folio-style cases for Apple's tablet computers. It's actually composed of two pieces: a hard plastic shell and a clip-on front cover made of the same material. The front cover attaches to the back with a round clip that fits into a cutout over the Apple logo; the front also serves as a base when the case is converted to become a stand. Three sets of ridges help hold…