Some things are just fun. [From: macosxhints]
Create a quick Stickies calendar
Type the following line into a sticky:
do shell script "cal"
Select the entire line and set your mono-spaced font.
Then (with the line still selected) type cmd-shift-*
This should replace the line with the result of the execution of the line as an AppleScript which happens to be the calendar. You will have a couple of stray double quotes to clean up if you want.