Tutorial: http://vector.tutsplus.com/tutorials/effects/how-to-create-dotted-surface-effects-in-illustrator/
Basically, this was a long tutorial, but I learned some cool tricks about how to use Half-tones and dots, and make some cool effects.
Here is the .ai file and also the .jpeg:
tutorial dots

Original Tutorial.ai
HOW TO CREATE A LIGHTSABER EFFECT IN ILLUSTRATOR
Step 1: Open a new document

Step 2: create a black background (its easier to see the effect on black)

Step 3: Draw a long thin rectangle

Step 4: Set …

Brushed Aluminum On A Radial

Step 1
Create an art board roughly 1024×768
Step 2
Click on the ellipse tool , and click on the art board to create a circle about 600×600. Remove the stroke , and set the …

How to Create an Awesome Snowboard
Final Image Preview

Step 1
Create a new document and choose web from the Document Profile drop down menu. Now change the size of the document,
so that you have a document that …

Creating an object with the Blend Tool and perspective
Final Result

Step 1: Using the Ellipse Tool make a small circle on the upper half of the art board.

Step 2: Using the Gradient Tool apply a gradient …

Create a seamless pattern using the Twirl Tool

Step 1
Open a new illustrator document.  Click on the rectangle tool then click again anywhere in the artboard.  When the dialog box opens change the dimensions of the …

How To Have Some Fun Using
The Graph Tool In Illustrator
A simple graph can come alive by adding
just a few simple visual elements.

Final Product

Step 1
Create a new document in Adobe Illustrator. …

This is what your final image will show up like.
Step 1

Add a square and adjust the shape to make hills of snow.  Next add your gradient mesh to the shape and use the direct selection …

This tutorial is going to show you how to create images out of text.

tutorial
some more examples are:

Baseball Tutorial