Image editing application software such as Photoshop or Fireworks contain a tool that will allow you to convert a bitmap image (such as one taken with a digital camera) in to a vector image (one that looks "drawn" - and one that can be resized easier.
If you are ever doing any professional logo design and have very little Graphic Design talent (guilty!), you can take an existing photograph and turn it in to a vector image to save yourself time drawing. For example, let's say you wanted to make a cell phone logo - you could take a picture of a real cell phone, "vectorize" it, and then just edit it to suit your needs.
If you're curious as to what I am talking about, you can actually try it for free on a Web site such as vector magic - they will let you try it for free without letting you save - or you can do it in a tool such as Photoshop or Fireworks.
Try it on Vector Magic's Web site for free
How to do it in Photoshop