I like the chronologically arranged pictures idea. Mine are all jumbled up, keeping track of what and when would make it easier when I realize 3 months later I still haven't been paid, and now so many other homes have been built I'm not sure which one I need to threaten to lien. True story, happened yesterday.
Those electronic signs are a money maker for their owners, a guy I know has one, and says the investment versus income ratio is much better then his rentals, and no tenants to put up with! Billboard work is great, any sign work, always fun seeing it years later, knowing you put it up there.