Origami with Rachel Katz is a good website for beginner origamists, which gives instructions for simple origami to fold.
A section called Storigami, which I found unique to her site, describes how to remember folds to create an origami. Each fold becomes a part of a story, so that the sequence of folds are easily remembers.
The Boat Box is yet another simple origami, looking best in dual coloured paper.
Model: Boat Box
Creator: Rachel Katz
Website: Origami with Rachel Katz
Instructions Link: Origami with Rachel Katz
Difficulty Level: Simple
Paper Size: 10 inch square