I'm looking for one as well, and the person I'm making it for can have carbs. I was looking on the Splenda site, they have recipes for powdered sugar so you can make your own icing:
3/4 cup SPLENDA® Granular
2 Tbsp. Cornstarch
Blended in blender until smooth.
And this cake recipe:
1 1/2 cups (375 mL) all purpose flour
3/4 cup (180 mL) SPLENDA® No Calorie Sweetener, Granulated
1 tsp (5 mL) baking soda
1/2 tsp (2 mL) salt
1 cup (250 mL) sour skim milk*
1/4 cup (60 mL) vegetable oil
1 tsp (5 mL) vanilla
*Note: To sour milk, pour 1 tbsp (15 mL) vinegar into measuring cup, add milk to measure 1 cup (250 mL).
Combine flour, SPLENDA® Granulated, baking soda and salt in bowl. Add egg, milk, oil and vanilla. Beat at medium speed of mixer until smooth, about 1 minute. Pour into greased 8 inch (20 cm) round cake pan.
Bake at 350°F (180°C) for 20-25 minutes or until cake tester inserted in centre comes out clean. Cool on rack.
I'm going to "attempt" this and hope it works out. *crossing fingers*