Creativity decks are sets of suggestive aphorisms for getting creatively unstuck -- for example, unblocking your writer's block. They come in several forms: as decks of cards, as PC and PDA applications, and even as scripts that you can consult via the Web, wherever you are.
The Observation Deck comes with a small book, a box, and a large deck of cards. All this might be too bulky to carry around if you want to consult it frequently. Junk the box and the deck of cards, but keep the little book. Number the book's "hacks" from 1 to 50. You can now use another randomiser instead of the deck of cards. I use the hundredths-of-seconds readout on my wristwatch's stopwatch setting, just discarding numbers that are too high.
Freeform discussion of this hack goes here.
Errata go here.