Resistors for your electronics projects are cheap, so the ohms often aren't always the exact value you need. Let's Make Robots shows off a simple way to fine-tune a resistor value with a nail file.
All you need to do is connect your resistor to a multimeter, grab a nail file, and slowly file down on the carbon film. After you break through the colour, you'll see the ohms go up. Slowly continue filing, and you should get it up to the value you need. If you want to seal it back up after breaking through that carbon, a little nail polish should do the trick.