We had some maple icing in the fridge, leftover from Mr. Fixit's birthday cupcakes (which were really banana muffins). Actually it was more butter than sugar--I got the proportions a bit off. I had the idea of thinning it down and using it in rice pudding, but we were out of rice.
We also had some leftover butterscotch pudding, the instant kind--something Crayons had asked for, but we didn't eat the whole package.
I combined the chunk of icing and the pudding with a bit of water in a large measuring cup, microwaved it for a minute, stirred it, and microwaved it for another minute.
Instant warm butterscotch sauce. Good over plain cake, muffins-in-a-pan, or something else not too sweet.
Not that I'd expect that everybody (or anybody) out there would have leftover maple icing and leftover butterscotch pudding, but when you have potentially compatible leftovers, it's always worth a try.