Use them in chocolate brownies! I did this at the weekend actually - though I used Celebrations rather than Quality Street- and it worked really well. When you make the tray of chocolate brownie mix just cut some unwrapped Celebrations in two and bury each of the half-chocolates into the mixture (so that each brownie gets roughly one half-chocolate). Mars and Snickers celebrations work best as the caramel sort of turns into toffee when you bake it (plus we seem to have more Mars and Snickers leftover from the Celebrations as all the Maltesers and Galaxy chocolates were eaten straight away).

I'm not sure if Quality Street would work in the same way, but it's worth a try...