Well... I love Global Communications album Pentamorous Metamorphosis - there's loads of great ambient sound on there.
However, there is one specific sound I really love - and it's is on a Steve Hackett album... I will make a small extract and post hre - I'm sure this won't be an issue.
Check back in a day or so and I will have it uplaoded for you to listen to. It is a type of 'Industrial Bell/Clone/Bang' sound... and it is awesome. I have tried in vein to replicate it on my synth to no avail.