I am in need of a diabetic friendly cake and icing recipe. Are there any recipes for sugar free icings, that are able to be piped? Thank you.

Buttercream is, by definition, made almost entirely of fat and sugar. 

See the discussion in this recent thread.  There's really no such thing as a "good" cake for a diabetic person, since any kind of carbs (including flour) is broken down into sugar, and sugar plays a structural and chemical role in cake and icing, as well the taste.

http://www.cakecentral.com/forum/t/825347/sugar-free-buttercream

SourLemonz ~~ Short answer, No.  (See the link provided by Magda_MI above). 

My solution for diabetic family/friends is not to make a cake at all.  I will buy an Angel Food Cake.   Keep the wrapper with information about the carbohydrates per serving, and, very carefully, pre-cut the cake into EXACTLY the amount of servings listed on the packaging.  I also cut some of those servings in half (a half serving contains half the carbs....) in case the diabetic person can only have a small number of carbs.

You can top the serving with fresh berries and a squirt of canned whipped cream.  You can also make a lemon faux glaze with splenda and fresh or lemon extract juice and drizzle on top before  you add the berries.   You can add fresh mint leaves to enhance the presentation.  It looks very festive and you are able to provide an EXACT carb count for each serving or 1/2 serving.

(Example:  3.5 oz. of strawberries is 8 carbs.  Most berries’ carb count is within the range of 5-12g net carbs per 100g/3.5 oz.)

if you have cake in moderation like a very small piece it wont jump up your sugar that much look for cakes made with apple sauce no sugar added rather than splenda as for the frosting i would go with a whipped cream frosting unsweetened with just a tad of powder sugar like a pinch or to  

im a diabetic and when i crave something sweet like some cake i take a small serving amount and i use whipped cream and some berries on top 

you could also get some of those sugar free packages of  instant mouse that are in the baking aisle you could use that as your filling 

I make this icing for my self sometime...not really a decorators icing, but if you are diabetic you have to learn to make compromises.....

1 container sugar-free Cool Whip

1 box sugar free instant pudding

3/4 to 1 cup low-fat milk

4 ounces cream cheese, softened to room temperature  (optional)

If using cream cheese, blend the pudding mix and cream cheese until smooth, then add the milk.  Mix on medium for about a minute until smooth,  Gently fold in the Cool-Whip.  Refrigerate the iced cake.

If not using cream cheese, just blend the pudding mix and milk, then fold in the Cool Whip.

The diabetic threads are appreciated by people who are trying to figure this all out (me being one of them).  There is so much more to it than "sugar free"!  

@ Apti, I loved your smoker's analogy on the other thread. :)

Happyfood~~Yes, diabetes is a bit*h.  I wish you well.