Check this free online software application pencil. It is used to draw animated pictures and turn them into 2D flash video or movie. To explore beautiful piece of art, this computer software can really be helful.Please note that it is not a substitute for flash, however its a kind of traditionally art on computer. You might be knowing the "flip of book" in which we draw many pics on different pages of book and then continously flip it to get the complete moving picture. This software does the same for you. Check this piece of its creation.
Just visit the website, click on download and use. This is free but not very easy to use. So before trying it please check the user manual. Its fun and creative.
You can check out pencil tutorial on youtube.