If you don't already have a paint program on your Mac you might want to give this one a try. Painting has basic tools such as pencil, free form brush, paint fill, dropper, lines, squares, and ovals. Though it's not nearly as powerful as many commercial graphics applications, Painting does offer a nice low cost alternative to them. It's like Stickies for pictures. Images may be of any size, and are displayed in frames that come in a variety of colors and patterns.
Frames automatically conform to the size of the images and can be arranged anywhere on the desktop.
Freeware Pict2Ascii reads pict files and interactively generates texts representing the pictures. Freeware Pictacular is a utility that can display a bunch of your pictures and movies on your screen one after the other. It's what we might call a slide show, but there's a whole lot more to it than mere image display. Watch as your pictures appear on the screen in 52 different ways, and fade out using 46 other schemes. Freeware QuickEditor is the cheapest QuickTime Video-Editing Suite for the Macintosh.