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See how to take an image and turn it into a brush so you can paint and create pattens with it.

Make a pattered image like a brick wall look like text is popping out of it.
Tip:
Instead of popping out, you can make the text look like it's going inside the wall by by making the shadow thicker on top than on bottom.

Make a Thumbnail Image in 3 Minutes
Shrink a larger picture down to a thumbnail or icon size.

Perspective Clone Tool will allow you to clone part of an image into the foreground or background. It does this by scaling the area at the same time that you are cloning it.

The Crop tool allows you to Cut off the unwanted edges of your pictures. After that, see how to resize your image bigger or smaller with image scaling.

Don't Stroke the Selection, Stroke the Path
This video shows you how take the selection of a circle (or square, text, or other shape) and draw the outline from that selection. First create a path from the selection, then remove the selection, and finish by stroking the path you created.

Take a photograph or website snapshot look like a piece of paper that is laying down.

Create transparency on the edges of your pictures so they look like they have rounded corners.

Add text to a photo in a way that makes it look like it's behind other objects in the scenery.

An introduction on using the Gimp tools main window.