Check out this site: www.graffiticreator.net
You can make your own tag using the fonts they uploaded. Click on one of them and you'll be directed to the creation page. In the type box, type in something, it can be anything and edit the design using the list at the right. Click CREATE to see the image and to change the colors, modify the RGB with the mouse. You can also change the width and height of the tag. When you're done, click SAVE and you'll be redirected to a new window where it'll tell you how to save and modify your tag. It's pretty neat!