I need to make sage green icing, but I'm worried about the color becoming too "grass green." Does anyone know a good way to get a good sage colored icing?

i think using a tiny bit of the juniper or moss green will give you a sage color. try a tiny sample first to see whaat one you like best

or start with a tiny bit of the green and add a tiny bit of orange

I always use either the moss green or the juniper...usually the juniper. If you don't have either of them, you can use a little leaf or kelly green and add in a tiny bit of brown to it. For the bottom of my tree cake in my pics I used the leaf and a tiny bit of brown.

Multiple charts state to achieve moss green use 1pt leaf green and 1pt orange

more than one chart states to use 2 pts VIOLET and 3 pts yellow

I've gotten a color which, to me, seemed sage by mixing leaf green with a smidge of brown.

On this cake, I used Americolor's "Avocado" color. It works well if you have time to pick it up.

http://www.cakecentral.com/modules.php?name=gallery&file=displayimage&pid=1223402

http://www.sugarcraft.com/catalog/coloring/colormixingchart.htm

http://www.rosebudpaint.com/images/color_mixing_chart.pdf

http://www.ladycakes.com/Charts/color_mixing.htm

http://www.candylandcrafts.com/colorchart.htm

http://www.deborahdolen.com/Library/ColorCharts.pdf

Sometimes, I'll even add a touch of blue to the green and brown.

Sage is considered a grey-green. I always add a bit of black to whatever green I'm using.