Isometric Projections by Daniel Wyllie, via Flickr
how to draw almost anything in isometric projection - Miquel Tura Rigamonti from Barcelona via Béhance
Isometric Animals by hedorah
Art Sub Lessons. Blog that breaks out according to assignment and grade level. Many are too young for middle school but can be resource for adaptation. Alternative to journals.
Poked Studio isometric illustration
Buildings for game 4 by Jonik9i.deviantart.com