While colleges have the budget to have a professional graphics department oversee the licensed used of their mascot to ensure it's consistency and integrity, high schools do not, and typically rely on generation after generation of student volunteer artists to create art for t-shirts, banners, the yearbook and other school projects. The problem is the lack of consistency. If you had 100 artists draw a panther, they'd all look completely different - each with their own style; and inconsistency is the single biggest factor in deteriorating a brand. The Pillsbury Doughboy doesn't look a lot different now than he did 50 years ago, and for good reason.
Use Christmas Clipart to Enhance Documents
So before you download clipart off the internet, you need to determine what kind you need. For the classroom and basic computer programs such as Word, you most likely just need to get royalty-free raster clipart. If you need to use a high tech computer and software with a vinyl cutter, laser, or CNC then you need a vector clipart graphic. Either way you should use royalty-free clipart to be legal for commercial and other activities.