One involved someone, I think they were a friend but weren't a real person, living in a geodesic dome in a wood in the grounds of a manor house of some description. I have duly read large numbers of websites about geodesic domes and on the 'I've suffered for my art, now it's your turn' principle I will be working this into my novel.
The other dream is a bit vague but I remember a meeting involving a mixture of real people, characters from Pattern Recognition and possibly characters from the modern segment of Cryptonomicon.
Sadly, I have just discovered that a novel, by John Fortune and John Wells no less, already exists with the title I had in mind - 'A Melon For Ecstasy'. Now fancy that. I have of course ordered a copy via abebooks.co.uk.