E.C.'s Old School Dungeons Tiles and Geomorphic Tiles are now available to download through RPGdrivethru and other OneBookShelf sites
By "Geomorphic..." I believe Eric just means square tiles which fit together - as opposed to the 10x10squares small scale geomorphs which usually have multiple exits.
E.C. is certainly a designer to keep watching, and I must confess that I am a little jealous at the speed at which he's brought his first three packs out!
Old School Dungeons / E.C.'s store on DTRPG