encrypted key paper wallet.. literally under the matress... only going this route cuz I have a waterbed.. Hence it is a non-trivial matter to actually get under the matress.
Sigg
What about if the bladder springs a leak ... your paper wallet may dissolve away or become illegible? I do NOT like paper wallets they are very fragile, fire, water, mold, chemical reactions, sunlight can all render them useless. For large amounts you must think more permanent solutions like engraving, stamping metals etc.
http://www.youtube.com/watch?v=DX6L2MWrPKQ
This is easy, cheap and private way to put codes on a relatively permanent media.