When you hook up a new printer, or just add new ink cartridges to one you already own, you often want to print off a simple test page. Next time you need one, try the Google homepage.
This tip is so simple, but it's actually pretty brilliant. The Google logo is colourful enough to make sure your colour ink is working properly, and the black footer links will prove that your black ink is ready to go. As a bonus, the page is so spartan that it won't use up much ink, even though it gives you a pretty good idea of your printer's health.
Most printers have a test page programmed in, but if you don't want to be mess around and activate it, this is a quick and easy alternative.