Picture Editor background colour

It would be useful if we had a feature where you could change the background colour of the picture editor to something else. At the moment its white/gray boxed grid:

<img src="http://dl.getdropbox.com/u/1024727/editor.png">

As you can see, its very difficult to do any editing when the sprites are primarily a white colour. It would be good to be able to change the background colour so you can see what your doing.

I hope this is reasonable request.

You can click the white/black-checkered icon at the top of the window to toggle the background between light or dark checks.

cheers, you are amazing.

I thought I checked all of those icons