An ElementaryPattern is a pattern like any other, but it is intended for novices. Most ElementaryPatterns are written by educators for students.
Some ElementaryPatterns are well known design patterns of the simpler sort like BobbyWoolf's NullObject. Others are written especially for novices.
The home page of the ElementaryPatterns project is http://www.cs.uni.edu/~wallingf/patterns/elementary/ -- JoeBergin
EugeneWallingford is also very interested in ElementaryPatterns and has an older page here with more explanations: ElementaryPatterns. -- JoeBergin