Gnomes don't crossbreed. Yo 'mama lied!
You haven't heard of knomes? Kender-Gnome cross. Who needs Cthulhu? This is the stuff of nightmares.
Gnomes don't crossbreed. Yo 'mama lied!
In no specific order:
Phanaton, Hengeyokai, Spirit Folk, Minotaur, Grippli, Tortle, Ilithid, Shardmind, Thri-Kreen, Changeling and Warforged
Are the once I really miss most of them could be solved with Mystara/Dark Sun/Kara-Tur/Ebberon Adventures Guide
Shardmind and Ilithid could be bundle up with what ever supplement that adds the Mystic