Ooh, Ivy meeting the angels would be super-interesting! They have enough in common -- essentially, information given form and personality -- and yet, as you mention, Ivy is all about codified structure and the angels are "we be free" entropy, and that would be fascinating.

I think you and I may have talked already about this -- what *I*'d love to see is Rivers of London crossed over with Urban Magic, and also RoL with Dresdenverse, and I would not be at all averse to a three-way between these fandoms, either.

While I don't have much interest in Bucky, and only episodic interest in Jarvis (as Tony's straight man, basically), I looove Three Laws fic, so that is an interesting one as well.

And I feel like Thomas/Justine would be hard to do justice to and keep in step with canon (which, as you say, rather made a muddle of this promising ship), but I would like to see it done well, maybe just ignoring the canon of the later books. (I used to like Thomas/Justine, but find that after Ghost Story I just flash back to that awful copout resolution and don't want to think of it anymore).

I may need to do this 'meme' myself. Various exchanges letter are starting to go up, and that always reminds me of all the made-to-order fics I'd love to see but never will since I don't participate in exchanges since I don't write myself.