This is a rather basic question but - How do I make an equilatoral (sp) triangle?
Make a regular square brush then hit Ctrl-3.
Ctrl-# where # is between 3 and 9 will give you a shape with that many sides.
Thanks, that helps alot! Can a similar procedure be used to create a pyramid?
Nah, you'll have to clip such such shapes. Clip it so, that you have a triangular shape in bot side views.