I've been a fan of the Holga 120-Series with its meniscus lens — and basically one measurable aperture — since I was a third-year college student. The vignetted capture that the leaky medium format plastic box camera created was unlike anything else I had seen outside of their pricier (and more advanced) Lomo series cousins. Ethereal results akin to a couple hits of acid and Floyd's Animals (or at least that's how I think I remember them). And while inexpensive, to refer to it as a toy never seemed entirely fair or accurate. In reality, it's a tool of considerable reach.
As others, Atlanta designer and photographer, Mark Weaver (Eye Static), has shared his results with Holgaroids, his Flickr set of Holga images captured while using a Polaroid back. Check it and if you haven't used a Holga, a Lomo, or the gorgeous Diana and would like to try your hand with one of these beautiful babies, pay a visit the Lomographic Society International site and take your pick.