The books mentioned in this chart, in alphabetical order, and the links to buy them at the BookDepository (yep I'm an affiliate!):
Adams - The Hitchhiker's Guide to the Galaxy: http://www.bookdepository.co.uk/book/9780345391803/?a_aid=Bookchemist
Aldiss - Hothouse: http://www.bookdepository.co.uk/book/9780141189550/?a_aid=Bookchemist
Asimov - The Gods Themselves: http://www.bookdepository.co.uk/book/9780553288100/?a_aid=Bookchemist
Benni - Terra!: http://www.abebooks.co.uk/book-search/isbn/9780394543536?cm_mmc=sws-_-sws-_-bd-_-serp&afn_sr=para&para_l=90 [not available on The Book Depository]
Brown - What Mad Universe: http://www.abebooks.co.uk/book-search/isbn/9780586071632?cm_mmc=sws-_-sws-_-bd-_-serp&afn_sr=para&para_l=90 [not available on The Book Depository]
Dick - Ubik: http://www.bookdepository.co.uk/book/9781857988536/?a_aid=Bookchemist
Varley - Titan: http://www.bookdepository.co.uk/book/9780441813049/?a_aid=Bookchemist
Wallace - Infinite Jest: http://www.bookdepository.co.uk/book/9780349121086/?a_aid=Bookchemist

A list of my favorite sci-fi books featuring talking dolphins, melting realities, gaseous characters and such. Overactive imagination for the win.
Have you read any of these books? Did you like them? What are your favorite books in this sub-genre?
Let me know in the comments!