DrScheme supports images as a basic kind of data. You can give images as arguments to functions and have functions return images. Here's a starter guide for working with images.
Most class assignments will give you images to work with. If you want to load your own images:
If you save the definitions window when it contains images, the images will be saved as well. Just be aware that files with images are no longer text files, so they won't print/view normally if you print/view them from outside DrScheme.
The best way to get the current list of image operations is to open DrScheme's HelpDesk (under the help menu) and search for image. You'll find contracts and purpose statements for all image operations defined at your current language level. The operations let you combine images, get the dimensions of images, and search for one image inside another (among other things).
DrScheme also includes operations for creating solid and outlined rectangles and circles as basic images. These operations are:
Colors are symbols of names of standard colors (there are too many to list here). A symbol is a ' followed by a word, such as 'yellow or 'red.