There's a burn mark on your carpet because of a dropped cigarette or fireworks you set off indoors (though carpet marks are the least of your concerns at that point). Let's bring out the scissors and hot glue.
Instructables user west49rules shares a technique he learned from a carpet repair man on how to patch burn marks with only scissors, a hot glue gun and some fibres from the edge of the carpet. Essentially you can just grab some patches of carpet fibre from the edge of your carpet—say in a closet—then artfully glue them over top of the burn spot. As you can see i the before-and-after shots at Instructables, the results are really nice.
Hit up the link below for a picture-filled guide, but keep in mind that this method is only as permanent and resilient as the hot glue you're using. So, use a quality hot glue and avoid cleaning your carpet with any solutions that would dissolve it in the future.
Have you tried covering up a carpet blemish with this or another technique before? What about other stains? Tell us about your experience in the comments. (Bonus points if there's a funny story behind how the carpet mishap happened.)
How to repair cigarette burns on carpet [Instructables]