Effortless Raspberry Iced Mousse by Good Food Magazine via bbcgoodfood: Goes together in 5 minutes with frozen raspberries, confectioner's sugar, low fat cream cheese and a squeeze of lemon juice. (pretty sure it won't be effortless for me)
Pretty and Polished: Slimming World Brownies. Works out as syns in total for the whole tin (including the icing). So you would just need to cut them into however many squares you like and work out the individual portion's syn value.