Some very simple variations in a design can create a totally different feeling or expression of your stitch designs.  Color of threads and stitch types can very quickly change a design.  Take a simple shape and try it with different edge stitches, no edges, fill stitches and color changes.  You will be surprised how easily it is to change the look of design.

Be careful how you choose color and edges.  Some will make a design look elegant and simplistic while other choices may make the design look more like a cartoon or kids coloring book design.