I wonder what it would take to commission one of these
and have all of one's actual, real-life possessions turned into
a scratch-off wall poster.

"Designed by Ross Cooper & Nic Woodley. The poster is decorated with over 400 hand-traced silhouettes depicting everything from a private jet to a garden gnome. The ‘scratch-off’ ink can be removed to reveal everything you have ever... loved, lost, created or destroyed. If you have ever played a lottery scratch card then you will be able to make this poster unique."
http://www.everythingihaveever.com/