Some good info here, and colour profile illustrations.

http://b-17-flying-fortress.actifforum.com/t193-b17-de-l-ign-institut-geographique-national-ign-b-17s

In the UK, we received from the IGN ‘Sally B’ of course, the IWM example at Duxford, Doug Arnold’s one to Blackbushe, and F-BEEA, which crashed and burnt at Binbrook.