In PowerPoint 2013, the default "pattern fill" color for all shapes is light blue. Is there a way to globally change the default "pattern fill" color for all shapes?

Further, for a given shape, if you set the pattern fill color to, say black, and then "Set as default", it doesn't remember this default if you happen to later on remove the pattern fill from this shape, then come back later to reapply the pattern fill. The original blue pattern fill color appears. Really annoying.