We've made 35 colorful frames for displaying any image. They are PNG format which means they can be used around any picture or art piece. They would be great framing pictures of all your students!
They are 2500 pixels x 2500 pixels and their resolution is 300 DPI which is what's needed for professional printing results.
Commercial use allowed as long as they are used in a design and are not re-sold "as is".
The papers are in a zip file so make sure you have the image editing software to use them.