Create SP_image_rotation

You will need to know some HTML so tweak this. The important part is your image library ID. To get that, go to the image library. Once there select "settings" then "Picture Library Settings." Now the URL contains the string for your repository. Copy that and past it in where "%7BB07EA484%2DBAAB%2D4A20%2D93B0%2DA93B78EC872B%7D" is. Load your pictures into that directory and they will be included in the rotation.

This is used in a SharePoint "Web Part". When you've created the web part, click the "content editor", then "Source Editor". That opens a box where you can paste the code.