gradients

Combine elipses to create the outline of a bowling pin, then use gradients to create the shadowing effect for that new object.
A good explanation on snapping(connecting) nodes is also introduced in this tutorial.

An introduction on using the Gimp tools main window.

Get some quick ideas on how to color, warp, and stretch your text a great logo.

Have your scene go from night to day with this easy tutorial.

Combine a white to black gradient with a wind filter to form a brushed metal look.

Decorate a rainbow across your text using the default rainbow gradient.

Create a custom gradient with multiple colors.

Encapsulation allows you to group object layers. You can then apply gradients and other effects to them.

Give your text a classic, outer space, science fiction look.

A general outline on making a realistic looking guitar.

http://vector.tutsplus.com/tutorials/illustration/draw-a-realistic-vecto...