http://blog.spoongraphics.co.uk/tutorials/how-to-create-a-vector-illustration-from-start-to-finish

If you’re a designer who just loves creating ‘stuff’, Adobe Illustrator should be your favourite tool! Armed with just a few tools and techniques you can use Illustrator’s range of shape tools to construct cool vector illustrations of anything. In today’s tutorial I’ll take you through my design process of creating a simple illustration of a water gun. The entire design is made from Illustrator’s basic tools, then the Live Paint tool is used to add colour. I’ll also show you some handy techniques to apply popular effects to replicate some of the popular illustration styles often seen on Dribbble.