If you've already breezed through your stack of brightly coloured jigsaw puzzles [1], then listen up, because there's an all-black puzzle in town now, and she's a tough one. It's available on the online store Zazzle and comes in a bunch of different sizes, ranging from an easy 30-piece puzzle to a ridiculously difficult 1,000-piece puzzle. The latter will probably take a week (at least) to finish, but hey, we've all got the time.

The coolest thing about the puzzles on Zazzle is that you can actually customise them beyond the number of pieces. So, while the default design is the Black Carbon Fibre Print [2] (£64) that'll possibly make you go cross-eyed, you could change it up with your favourite photo for a personalised gift, or a special treat to yourself.