It was mentioned here:
http://theforest.org.uk/bb/viewtopic.php?t=1861
Anyway...just do it! Photos were taken at the time.
What people can do right now:
Take down all paper
I think it will need at least 2 coats of white paint - because it is dark and the colours quite strong and if you want to lighten that wall this will be necessary.
So make sure you have a good supply of the right type of white paint.
Please take care of paint on the stage, floor and on the speakers - so get the sheets out. Make sure you clear the stage of equipment first.
Remove those flashing lights and put them somewhere safe.
Please don't touch the black on the lower walls or top section. That's still good.
Check and see if the cinema wall needs a fresh coat of white - if so you can do this at the same time.
I also think the red walls on the other side should be included in this, with the Hunting Fox going too. They look pretty tatty.
The library is going to expand along the wall at some point soon. Imagine one bookcase taking up space on the right hand side of that wall, and consider that in your mural plans...paint it for sure but don't put stuff there that will get covered up.
If you want to do mural please use good paint - not just dregs you can find in the workshop. Please don't use the exterior wall or wood paints, and definitely not the floor paint. Go to the shop and get some nice colours...
That's all I know. Happy muralation!
(I assume the no-tree rule applies though

)