The Second World War in colour is quite good, as is the First World war in colour...but that doesn't seem to have made it to DVD yet

Colour adds a new dimension to it all. The World at War is a classic AL, and well put together, I remember seeing bits of it when I was about five or six, my Dad used to watch it...Olivier narrates it well.
AH! There it is:
WW1 in color (Couldn't find it because I put in 'colour' instead of 'color'

)
Hope they're helpful.