We have had customers purchase a variety of colors of KinderMulch or RhinoMulch rubber mulch and mix those colors together.  They often will do this for a playground, but I'm sure the same could go for a landscape as well.  If you are really interested in this look for  your playground and want to see the way it would turn out call in and ask for Rachel.  She will get you a picture of the mixed mulch look. 815-436-5587.