T Kingfisher is the psuedonym of Ursula Vernon - she writes kids books under her real name, and is trying to avoid anykid searching for the new Hamster Princess book to find her horror stuff. She is excellent under both names - closest thing we have to Terry Pratchett now, in my "got all the books" opinion. Get all the books. You can read her long webcomic serial for free at diggercomic.com or try this short short as a sample: www.redwombatstudio.com/2014/06/26/toad-words/
Classic style fantasy? You've no doubt read Tolkein, Phillip Pullman's "His Dark Materials" trilogy, Jack Vance (Tales of the Dying Earth), Ursula LeGuin's Earthsea quintet, Diane Duane, Diana Wynne Jones? So on to slightly less well known ones:
David Gemmell, start with Legend.
Lawrence Watt-Evans "Ethshar" series are great, his protagonists are very sensible.
Comic wordplay and rampant surreality including occasional time loops? Jasper Fforde's "Tuesday Next" sequence.
Magic harnessed as economics, with undead liches running cities? Max Gladstone's "Craft" sequence.
Encrusted strangeness in fantasy worlds? China Mieville, "Perdido Street Station".
Byron/Cthulhu crossovers? Tim Powers, "The Stress of Her Regard" or for more pirates "On Stranger Tides"
Jack Vance style far future fantasy/scifi crossover oddness? Matt Hughes. "9 Tales of Henghis Hapthorne" is a good starter.
How about urban fantasy - magic, gods and elves in the 'real' world?
Ben Aaronovitch "Rivers of London" series for modern police and modern small gods.
Elves kicking ass in LA? Seanan McGuire's October Daye series.
Hard boiled elf detective in the 1930s? Ari Marmell's "Mick Oberon" books.
Magician in modern west coast America? Jim Butchers' "Harry Dresden" books.
Near future Chinese detective with a demon wife and a badger that is sometimes a teakettle? Liz Williams' Detective Chen books.
Like Pashazade, I could go on all night!