I forget which thread I put this on now!
Get some raw low sugar jelly (2 Syns for the whole lot) make it up as directed and when it's almost set (but not quite) mix in a mullerlight and return to the fridge to set fully. You can also mix in fruit.
It's fun to experiment with flavours, Strawberry jelly with banana and custard yogurt, Orange jelly with strawberry yougurt etc