Tux Paint is a free, open-source drawing program for children aged 3 to 12. It can run on Windows, Mac OS X, and other platforms. With Tux Paint, it's easy to make drawings, add stamps (images) from their stamp library, and add text. Each time you use a stamp, the name of the image is read aloud. Below is the sum of my efforts, with a label in Koasati:
Because it's open source, Tux Paint is also customizable. With some preparation and help, teachers can create their own library of images and even record words in their own languages. Artwork can be printed or saved and edited for use in flash cards, calendars, and other projects.
Teachers should plan to spend some time reading the documentation and may need just a little help from a techie. It took me a long time to find where drawings were stored in Vista. I'm looking forward to playing with this more, though, and I'm quite a bit older than 12!