Switching ruler shape and images for public usage

I'd like to let you know that now you can switch the shape of the ruler. For now simple ruler and l-square ruler is available. In my plans to add some more shapes and probably new skins, in other words ability to change ruler appearance.

I know that a lot of people go to this site when looking for ruler image, so now all my ruler images are listed in new "Ruler Images" section. Moreover these images are allowed to be used wherever you want for free, you are welcome!