I don't have a picture of mine, but it's very simple - a cheap seam ripper, a small block of wood with a hole in it the diameter of the stem of the seam ripper.
I stand the seam ripper in the hole, take the cap off and use it to snip/cut the thread just like the more expensive type that uses an old rotary cutting blade. It's not as "safe" so I am very careful not to leave it with the cap off. I do not have little ones or pets that I need to worry about.
It's very portable and my hubby has made little blocks for my friends so they can make their own version. My block is about inch thick, and about 2 inches square.