These images is under a CC BY-SA 3.0 license. That means you can use them anyway you like as long as you give me credit (you can link to If you alter the image you must release the result under the same license. There is also this folder that contains the .svg files for some of the images (you can use Inkscape to open them). Everything in that folder is under a CC BY-SA 3.0 license as well. If you have any questions, feel free to contact me.