well some of mine i use as a blush! redhead, smoothmerge, blobe for example. because they're quite pigmented on my pale skin. or sometimes i'll layerthem over a blush to give a nice sheen.
ones like perfect topping i use as a highlighter on my face and sometimes on my eyes too!
and cheeky bronze i can use as a bronzer (but only on the cheek area because it's sparkly)
so you can use msf's in many ways!