The classic game, which dates back as far as 1984, has been the inspiration for everything from jewellery to shelving and kitchen tiles. But now it's taken hold of the humble notebook too – and not just with the cover design.
The inside is split into coloured sections and for each of those sections there are notches, which when combined, create a pattern of Tetris pieces. Very nice.
Cheap enough too, with Forbidden Planet selling these for just £5.99.