All clipart on this page may be feely downloaded and reused/remixed. Choose from two formats: png and svg. The SVG flavor is that of Inkscape, because that's the tool I'm still learning to use. If you choose the SVG format, you may open the file in an SVG editor like Inkscape to modify as you wish. If you only need a finished clipart, just use the PNG, though realize that it will not endlessly resize without loss of detail. Using the SVG file will allow you to export at any size you want.
To get the graphics for your own use, download them to your computer. Please do not link to the originals here. Right Click the appropriate download icon below the graphic you want. In the context menu which opens, choose "Save Link As..." (Firefox) or the equivalent choice in the context menu of your browser.
For PNG use this download link icon or this for SVG in the grid below.
If you wish, there's also an annual feed to add to your preferred feed reader.