"Natty" (her childhood nickname carried over into her blog) gives a simple step-by-step to assembling a $2 custom swatch book. Simply paint portions of the stir sticks they provide at hardware stores, drill some holes, and use a large binder ring to secure them. It would be simple to include any wallpapers you might have, wood stains or colors, and fabrics you'd like to match.
If you're like me, constantly adding projects to your list and bringing home new ideas for furniture and curtains and anything else imaginable, this is a fantastic and useful tool!
(Images: Natty by Design)