I played in paint.
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A small banner- small enough to be considered a button, that could be used to keep track of where you are, word-count wise. It can easily be edited in Paint. ***As a
.PNG file, it will not become fuzzy or pixelated like a .JPG. (.JPG SUX!) (XP) It is simple, not-too-loud, and tasteful. It isn't very exciting, but it also doesn't come across as impudent, prideful, pretentious, or lame.

The finished WriMos get a gold star. XD
The base is such:

(The star for finished novels can be drawn in with light and bright yellow, with Line Tool and Fill tool, or another distinguishing shape could be used.)
I'm sure someone could come up with a more fabulous base, but the basic idea is that everyone participating is in charge of creating, editing, and maintaining their own "NaNoWriMo Button".
As a button, it functions well: Participants can put it in their signature to link back to this thread, their WriMo blog, or another pertinent location.
Example:
[URL=http://www.gaiaonline.com/forum/viewtopic.php?t=7709907&highlight=][IMG]http://img.photobucket.com/albums/v221/Ivydoll/Color/NaNo1.png[/IMG][/URL]
[URL=http://www.blogger.com][IMG]http://img.photobucket.com/albums/v221/Ivydoll/Color/NaNo2.png[/IMG][/URL]
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