Sugar free royal icing? I don't think that's a possibility. Royal icing is mainly composed of sugar.
Since royal is basically powdered sugar and egg white, you probably can't do it without the sugar. (Don't want to say that definiteively becaseu someone else may know better).
What are you trying to accomplish? Maybe we can help you figure out another way to do it without royal or sugar. (That's the research librarian in me trying to ask leading questions....LOL)
Shalom,
itsacake!
What is the royal icing for? If its just for decorations your friend can just take them up off the cake. Most people that I know of don't actively eat royal icing decorations anyway. If its for cookies then I am not sure what you would do unless you can try making some sort of cooked icing recipe using Splenda. But Splenda wouldn't work in place of powdered sugar.
OOPS, I GOOFED!
I just deleted the recipe for chcoloate Splenda icing I had posted here yesterday when I realized just now that this was suppposed to be a thread about cookies and that this icing won't harden and therefore should probably be reserved for cakes. The problem was that it had an error in it and I realize I should have just edited it to correct the mistake in case someone had copied itI The recipe as posted called for 8 tsp of dried egg white and 8 Tablspoons of water or the equivalent of 2 egg whites. It should have said 4 (FOUR) egg whites. If anyone wants the recipe please PM me. If you copied it from here, please correct the mistake.
Sorry about that. I hope it doesn't cause a problem for anyone.
Shalom,
itsacake!
I'm a diabetic. Just wanted to give you ladies some ideas. There's a special powdered sugar for diabetics that you use cup for cup. Here's a link. It's sugared with Malitol. Which if overendulged can cause GI issues, but tastes like regular sugar and Is good in moderation.
http://www.eatsugarfree.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=949&Category_Code=BGD&OVRAW=sugar%20free%20powdered%20sugar&OVKEY=substitute%20for%20powdered%20sugar&OVMTC=advanced
Hope this helps a bit 
~Rebekah~
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