Squeak Etoys is a "media authoring tool"-- software that you can download to your computer
and then use to create your own media. You can write out your project and share it with others.
Etoys runs on any Mac or Windows machine, as well as on the OLPC XO machine.
It is free.
Find out about Etoys.
Text of this guide (for searching): Paint Tools: The Paint Bucket Fills Spaces with Color. Click on the Paint Palette in your Navigator Bar.
Draw a shape with a brush. Select the Paint Bucket Tool and click to fill an area with paint. Put the tiny + at the tip of the Paint Bucket on the part of the sketch you want to color.
The design's background color
can be changed with this tool too. If the shape has a opening in its edge, the Paint Bucket's color will flow out beyond the shape.