All files are 10 inch by 10 inch square PNG files, at 300dpi.
Pictures are licensed for any personal use and for commercial use in any educational product (or marketing materials for educational products). Credit is appreciated but not required. All images are copyright to me and are created by me and are not to be onsold or given away as clip art - if they're adding to your work that you are selling that's great, but you are not permitted to sell or distribute them as images or on their own. You are not permitted to create derivative works from them and sell them as images, but you may change them for use in your personal or educational commercial products (worksheets, units, etc.).