I know, none better, that there's a million miles between an idea and a finished book, but still, a good high concept can be worth a lot - so here it is and if you write the book, let me know and I'll buy one.
I love to bake, and I have lots of cake books, but one problem with them all is that every recipe seems to need a different sized tin. Thanks to TK Max, I am building up a good collection, but it's costing me a fortune, and there's the storage problem. (There's an overflow in a box on top of the wardrobe!)
Here's the idea: why not produce a recipe book that featured different cakes that can all be baked in the same tin?
The 8-inch Round-tin Cake Cook. (Or 20CM as I suppose one should say these days). It could be a series: The 8-inch Square Cake Book. The 10-inch square...the bunt... the 9 x 5 loaf tin... well, you get the idea.
Every time you bought a new book, you'd buy a new tin to go with it. You could even bundle the tin with the book.
With a book themed around the cake tin, the reader would be saved the frustration of flicking through a recipe book and going, 'Ooh, that looks nice! Dang! No 11-inch square cake tin. How about that one? Arrgh, you need a 1.5-litre bunt tin and I've got a one litre and a two litre but not the 1.5."
Like I said, I'd buy it.