You know those desktop daily calendars?  The ones that have comics or "You might be a redneck if..." type stuff on them?  It would be cool it a company could allow you to custom-design one of those calendars online with up to, say, three different attributes, and then print it out and ship it to you.

Your calendar could even have personalized dates in it, like birthdays and anniversaries and such.  You could provide digital pictures for inclusion on combined Saturday/Sunday weekend dates.  Company holidays or pre-scheduled personal holidays could be included directly into the calendar.  You wouldn't even have to start the year with January, nor would you have to include an entire year's worth of dates.

Neat options for inclusion would allow you to pick, for example, motivating sayings for Mondays, and comics on Tuesdays.  Licesenses for factoids from the Farmer's Almanac could probably be obtained for reasonable prices.  Otherwise, you could just sift facts of different categories out of regular reference works.  A word-of-the-day feature would be darn simple to enter.  Each edition of the calendar would be fresh because you would maintain an account that would make sure you didn't get duplicates.

The construction of the calendar wouldn't be too difficult.  A laser printer could print out the designs from a custom application.  The paper would have multiple dates printed on one sheet.  The sheet could be cut and collated, then glue-bound and attached to a board and stand for hardly anything.  You could do half of the work at Kinko's and start up for probably under a couple of thousand dollars with a cheap PC, printer, cutter, and binder.

Sheesh, I may quit my job.