There are quite many styles of lacing.
From a mathematical point of view there could be more than 2 million combination to let a lace passes through the six eyelets of a shoe.
The basics remains the same as, as kids, we started doing it ourselves, but there are very many ways of lacing, according to styles and occasions.
To get an idea on the most popular styles of lacing click on

http://www.fieggen.com/shoelace/lacingmethods.htm