Just put this WatchFace up on the Pebble App Store.
You can search for SpyWatch, or use this link on your phone:
It doesn't look like the forum lets us directly link pebble:// addresses yet.
This watch is an attempt to be a replica of the TF2 Spy Invis Watch
It uses the accelerometer to track your motion. It loses cloak energy as you move, and regains it if you sit still.
Unfortunately, just the like TF2 Spy Invis Watch, this watchface does not show the time.
I have to give lots of thanks to my friend Scott Beaudry (Scottbee) for providing me with the art assets.
Here's a couple screenshots of what it looks like at various levels:
The source is available here: