i tried to change the color of this pin mark
(i took the svg file from http://www.clker.com/cliparts/G/R/Y/M/S/g/map-pin-yellow.svg)
in point layer:
by opening the notepad of the svg file and adding those line into the notepad of the svg file
fill="param(fill) #FFF" stroke="param(outline) #000" stroke- width="param(outline-width) 1"
but with no result.