There are 10 Origami Designs in Olympiad 4:

Design	Designer	Page	Details	Photo
Show only designs with photos
Ghost fighter Imaginary beings	Hojyo Takashi	2	Square Also in Origami Tanteidan Magazine 107	Folded by Artur Biernacki
Boar Mammals - Suidae - Pigs and Boars	Hideo Komatsu	10	Square Also in Works of Hideo Komatsu by Hideo Komatsu	Folded by Eyal Reuveni
Tiger Mammals - Felidae - Tigers and Leopards	Sipho Mabona	12	Square Also in AEP convention 2009 Crease pattern	Folded by Fabiana Sanapanya
Lufengosaurus Dinosaurs and Prehistoric Animals - Jurassic - Jurassic Dinosaurs	Tran Trung Hieu	15	Square
Beaver Mammals - Rodentia - Rats, Mice and Rodents	Brian Chan	19	Square
Mouse Mammals - Rodentia - Rats, Mice and Rodents	Andrey Ermakov	22	Square	Folded by Rui Roda
Eurypterus Dinosaurs and Prehistoric Animals - Paleozoic Era Prehistoric Animals	Satoshi Kamiya	28	Square Also in Origami Works of Satoshi Kamiya 3 by Satoshi Kamiya Crease pattern	Folded by Artur Biernacki
Mosaic Geometric and other shapes	Traditional	32	Square Crease pattern
Mosaic Geometric and other shapes	Andrey Ermakov	33	Hexagon Crease pattern
Grasshopper Insects	Jason Ku	36	Square