The cool thing about Blackberry is that she's one of many adorable cats disproving the belief that black cats are not photogenic. Believe it or not, many dark-colored cats are left behind at shelters due to adopters' assumptions that the cats will not photograph well. According to The Telegraph "hundreds of the animals are being abandoned as their owners complain that black animals do not photograph as well as their lighter and brighter-coloured counterparts, making them less popular with those who enjoy posting self-portraits with their pets on sites such as Facebook."
Black cats have also been superstitiously labeled as unlucky omens for centuries, which may also account for the surplus of homeless black cats. The ASPCA is quick to address this concern by noting that black cats are actually considered to be lucky in many other cultures. The only bad luck these cats have, it seems, is that they aren't being adopted.