There is this one:
http://portableapps.com/apps/graphic...kground_window

But I don't know if it works with non-portable version of Gimp.

Also, there was one of the name "deweirdifier" (you can google for it) but it seems not to have been updated recently.

My preference is to work in full screen mode (F11). A double tab brings up all the floating tool boxes, and going back to work on the image makes them all disappear again.

Once you get use to it, you find that having the full screen to work in is a nice feature.

-Rob A>