Best way to save/organize custom graphics created in PowerPoint07
I hope I have posted this in the correct forum. I often need to created my own clip art images to use in my courses. I use the shape tools in PowerPoint07 to create and layer various shape to create the graphic I need. This is great because I can change the colors, size, look, etc or turn them into .png as needed. My dilemma is how to keep these for use in other projects. I want to preserve the flexibility of the grouped object and not just store then as image.
For now, they are stored in a "workbook" PowerPoint for the initial project, but this make it difficult to find them later.
Is there a file format that will preserve the grouped object or has anyone found a PowerPoint filing system that has worked?