QUOTE(Zackster @ Dec 11 2007, 11:09 PM) [snapback]29395[/snapback]

why would u want to draw crumbled paper
A lot of people consider it good practice to draw crumpled paper. It's a great way to practise seeing spaces, shapes and proportions without having your subject really get in the way of it all.
Especially for beginners it can be very hard to try and draw an object with just lines and shapes without having a tutorial that breaks it all down for you. Even having a simple coffee cup in front of you, it can be hard at first to break it all down into ovals, circels, curves and lines, but with a piece of crumpled paper that problem is gone. There's nothing but edges and shadows and you can concentrate on each of them without having the urge to try and draw the whole object at once.
And once you get the crumpled paper down in a drawing, it can be re-used to practice finding values and applying shading.