here are a couple I use. sm pkg sugar free strawberry jello dissolved in boiling water ( 1 cup) when thuroughly dissolved stir in a small container strawberry yogurt, mix well. refrigerate. or any other fruit combo
sm pkg sugar free lemon jello dissolved in 1 cup boiling water. and use 1 cup lemon lime soda and 1 or 2 tablesp lemon juice.
you can let these set in a pie dish and slide into a graham cracker pie crust and top with sugar free coolwhip