straight

See how to put layers in a straight line on your canvas. If you have small layer shapes like circles, you will need to make sure the layer border is reduced to the edges of the shapes (using autocrop).

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

A few simple examples of using Bezier lines.

See the wide variety of creation possibilities with the star tool.

This tutorial shows how you can create straight lines by simply using the shift key.
Skip to step #2
http://www.gimp.org/tutorials/Straight_Line/