Take a photograph or website snapshot look like a piece of paper that is laying down.
Bend, stretch, and mold your text into different shapes.
Convert a picture into a vector graphic using the Trace Bitmap effect.
Get started using Inkscape and creating shapes.
(One mistake in this tutorial- You can snap objects together. To see snapping options, go to the menu View->Snap)
Make characters look like they are sticking out of the picture frame.
More Rare things to do with Paths.
Text Along Path
Selection to Path
GIMP 2.8 UPDATE:
For text along path, right-click on the text.
Transform one shape into another across a distance.
Fast Forward past the first 45 seconds of this video.
Learn how to use the iwarp filter for squishing, stretching or growing images in weird ways. Good for making funny faces.
Learn how to convert a a bitmap/jpg image into vector.
This is another tutorial that shows different ways that a photo can be converted to black and white.