Smiley face by Marc Kirschenbaum

Diagrams in Pure and Simple Origami by Marc Kirschenbaum
Folded from a square of Duo Thai origami paper

Stop sign by Shuki Kato

Diagrams in Origami City by Shuki Kato and Jordan Langerak
Folded from a square of origami paper

Toilet sign by Kubota Yaeko

Diagrams in NOA Magazine 218
Diagrams in NOA Magazine 218
Man from 2 units, Woman from 5 units of origami paper

USB port by Sy Chen

Diagrams in BARF 2005 Spring by Jeremy Shafer
Diagrams in BOS Convention 2005 Autumn
Diagrams in Origami USA Convention 2005
Folded from a square of Japanese Foil