They're sturdy, squat and seem to be a perfect marriage between the bourgeois trade paper and the affordable, utilitarian mass market. My only complaint, as someone who has been in the book industry off and on for close to 10 years, is that these small imprints never publish enough titles in order to justify their acquisition for aesthetic purposes. You couldn't turn your entire library into a homage to the Olive Edition, but they would look quite cute stacked up on your nightstand or on a small bookshelf in a reading nook. Their spines feature groupings of horizontal lines which appear to be handrawn in the color featured on the cover with a small, tidy title/author reference. Olive Editions are priced at or around $10, though many of them seem to be out of print at this point and might be available for much less or even at your local used bookstore.
ETA: Erica from The Olive Reader left a comment and gave this very helpful information about the Olive Editions. Thanks, Erica!
"we're publishing/have published the olives as limited editions. the first three (the unbearable lightness of being, everything is illuminated, and mysteries of pittsburgh) were published last fall and are now out of print, but the response we got was so awesome that we did another three this fall (fast food nation, bell jar, and crying of lot 49) that are available now for a limited time."