The Shoulder Tattoo design is an arm with a tattoo. You can make the tattoo from a picture that is white everywhere you want skin to show, and dark where you want the tattoo.
If you are using a phone or tablet, you might be more comfortable with a gesture-based version of this page. This is experimental.
If you have trouble on an older computer, try using an alternative version.
This is a 400x300 design, with 800x600 available to subscribers.
This design is by paulfitz. The design is made using Blender, a free and open source 3D animation suite.