Create a stylized First Aid icon from a simple rectangle, is it possible? Ryan Quintal and Vectortuts+ brings you this screencast of the popular written tutorial.

" In this tutorial we’ll use a combination of craft and Illustrator’s 3D tools to create a first aid icon. You can use the techniques you learn in this tutorial to create realistic rounded box icons of your choice. This works well for complex icons at large sizes and scales down nicely. " - Simona Pfreundner

Here is a link to the written version of the tutorial Create a Stylized First Aid Icon in Illustrator and the video version is below.