When I'm avoiding sugar but happy to stuff my face with all the fats in the house, my solution to this is an old-fashioned strawberry shortcake, made with a biscuit dough. You can even bake the biscuits in 8 or 9" rounds and stack them with the berries and whipping cream for a more traditional cake effect. I think it would also be relatively easy to make something along the lines of
Cathy's jello dessert, using sugar-free jello and sugar free cookies or, again, your own creations from biscuit dough, as the framework.
Sugar-free pies are often also pretty easy to find. They're always available at the Daley Center Farmers' Market, for example. Or you could make your own. Sugar free cook n serve chocolate pudding isn't half bad, for example, if you add some more chocolate, and maybe a little expresso, and, of course, a ton of real whipped cream!