Design Stitch offers their custom sets to a limited number of buyers. Limited quantities promise a guarantee of originality. These sets are usually sold to only six customers before they are listed as sold out.
The magnetic lasso tool allows you to select specific parts of the clipart. The result is that you don't have to color the entire image the same color. Magnetic lasso properties can be altered to fit your needs. However, you must be familiar with the lasso tool in your particular program.
Much of the school mascot clipart available also features aggressive looking characters for competitive sports. While this is fine for older kids, you may want to search for something more kid friendly if yours is an elementary school.