Here are two links I found of quilt patterns made with just four fabrics, plus the BQ3 pattern, which looks like it uses four fabrics. These might help you picture how your pattern would look when made with four fabrics instead of the 16.
http://justquilty.com/2013/04/make-a...-four-fabrics/
http://www.amazon.com/Pick-Four-Fabr.../dp/1604680202
http://www.amazon.com/Maple-Island-Q.../dp/B0027S63D6