I think this was quite an ambient one.
Wow, this thread takes me back! I love "Surfing on Sinewaves", an Aphex Twin ambient classic. Have it both on vinyl and CD.
My personal favorite Aphex Twin album has to be the seminal "Selected Ambient Works Vol 1 (85-92)".
This is the Album that changed my whole outlook on electronic music and the possibilities it provided. I would urge anyone with an interest in this kind of music to take the time to listen to this collection. Some of you may know Aphex Twin for the more industrial sound clash material he has created since this time, don't be put off as this is very different. And you should consider the dates that this collection was created - 1985 - 1992. It is light years ahead of its time.
Other ambient electronic music of note in my opinion is Future Sound of London - Lifeforms and some of the sessions they did back in the 90s for Kiss FM. Truly stunning and other worldly.
I'm off to dig out my CDs as this thread has triggered some great memories!