There are some great recipes in the low carb forum, it can be a bit daunting as its a LOT of pages to go through, but some of them have been put into a clickable list by forum member PurpleKat on the low carb vegetarian thread. The desserts go over two or three posts as there are so many of them but it might be an easier way to find some recipes to start off.
http://www.diabetes.co.uk/forum/threads/vegetarian-vegan-low-carb-recipe-index.61859/
I personally don't like sweeteners so I often adapt recipes, my favourite chocolate cake one is below, I make a big version for parties, it is a very intense chocolate taste, so don't need a lot an extra sweetness comes from serving it with cream.
Ingredients:
4 eggs
200g cream cheese/Philadelphia
100g butter
100g dark chocolate (70%)
Flaked almonds or any nuts - optional
(1 tsp vanilla flavoring)
Preheat the oven to 200C/180 fan.
Grease a springform with a little butter.
Melt butter, break chocolate into pieces and stir until melted, dont overheat or else you get a grainy mixture. Beat eggs until really fluffy and voluminous, add the cream cheese, a little at a time, beating well after each addition.
Using a spatula stir in the chocolate butter mix, stir well.
Pour batter into springform tin and sprinkle with nuts.
Bake on the middle shelf for 15 - 20 minutes.