So far I've discovered a ribbon swatch book, 2 catalogues of dies and punches here and here and a colour swatch book of colouring media.
I found the latter particularly interesting. It can be used to assess the true colours of your pens, pencils, inkpads etc without having to scribble on a bit of scrap paper every time you use them, and also to stop you duplicating your stash when you see a sale just in case you haven't got that colour!!
It is definitely one of those projects that I will endeavour to tackle in the new year - along with my ribbon holder!! My other task is to add a sticker to the bottom of all my inkpads showing the colour of the ink so I can see immediately what colour they stamp out at.
Becca also has a great ribbon storage idea here that might be of interest to some of you. My only concern would be that the ribbon would crease if wrapped around the board.