Digits Calendars & "Will Return" Clocks

Despite their "digital" appearances, the Digits line of calendars and time notification signs require you to manually change the digital display to notify others or yourself about the date and time. Seem like a good home office or cubicle gift...

The whole line of acrylic Digits displays are available at Ponoko (yikes, the prices are a bit steep, but perhaps because of the small run from an independent designer).