Dang! I didn't know what to name it so I named it photo_mosaic and put it in my plug-ins folder. It doesn't show in Filters > Artistic. I did close and re-open GIMP after saving it, and I did allow it to execute as a program.
On the splash screen when it was being queried in the plug-ins it took a very long time to load. At first I thought GIMP was going to freeze there but then it went on and loaded.
I wish it saved as a file rather opening the plug-in. What do you have it saved as, Greg? Did you put a .py extension on it?
Ignore all the above. I put a py extension on it and it works fine.
PhotoMaster wrote: I like the outcome, but the image bleeds/extends beyond the border edge.
The final image comes out larger than the canvas. You need to click Image > Fit Canvas to Layers and the image will expand to fit. Then do Ctrl + E to see the full-sized image.
I used the default settings and got this.
Before I started the script I made a copy of the original layer. Ran the script, then on the original layer I right-clicked the layer and scaled the layer to fit the current size. No "holes" in the edges.
If anyone wants the plug-in I saved, download the attached one below. I had to zip and save it for it to upload in here. Be sure to unzip it before putting it into your plug-ins folder.
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to select the border, did a selection invert and used the eraser tool 
to erase the bleed/over extension. Here are a couple of images.
