Clker.com is my new favorite online tool for graphics. There are so many things you can do here. They have a smart drawing tool and you can upload your own pictures and they will be automatically vectorized. Really cool tool!
Also you can access tons of clip art and share what you have created. There are more things to do here but I have to find the time to explore them. This is a great find for me. I hope you can use it too.
You do have to sign up for a free account but I think it is definitely worth it.