The quality of the cards are great - in a paper fight, these thick cards would win hands down for sturdiness. Also, the cards are held to the spine with glue, which means you don't have to put up with craptabulous tear-along-the-dotted-line needlessness.
Rummage through the subject lines of your spam box, hand-paint artsy-fartsy color and styling on them and print them on postcards and voilà - you have this book. All 30 cards are colorful and creative. Some of them are appropriate to send to male friends, some to female friends, and none are appropriate to send to children or your grandma (as you can imagine, there's a lot of sexual innuendo and general rude funniness).