It is, however, eminently modifiable, decorateable (is that a word? It is now.), and suitable for using indoors.
Even better, it can be educational (see the last step).
Print one out with your corporate logo, then if you're caught playing with one of these at work, tell them you're using your initiative and testing out a potential marketing tool...
Step 1: The template
I have included a PDF drawn up from a scan of my original sketch, including two versions - one decorated, one plain and awaiting decoration by your good self.
Print out the one you want, then cut it out, including the seven rectangles at the top.
(If you are going to decorate your frisbee by hand, do so before you cut it out.)
Step 2: Score!
Step 3: Up hill and down dale.
The outer ring of lines needs to be mountain folded, and the inner ring of lines needs to be valley folded.
As you do this, the pacman-like gap in the template will close up, allowing you to glue the tabs on one side to the straight edge on the other side.
When gluing, use whatever suitable glue you like (glue-stick, "white" glue, even wood glue), just don't use a vast amount, or your frisbee could be unbalanced.