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): Script Tile: A Bounce Tile Changes
an Object's Direction When it
Touches an Edge
Click the green clock to start and stop the script. Paint something and open its Viewer.
Make a script with forward by 5.
Click on basic and select motion from the category menu. Add a bounce tile to your script.
Change the forward by number to a bigger number, like 10 or 20. Click on silence in the script tile to see a menu of sound choices.