As I can see it, there are two technics that "use" tori's body, while the rest use uke's body against himself. Thoose two are koshinage and iriminage. Tori uses his own body to make uke 'rotate'. Compare this to kotegaeshi which makes uke rotate because his own arm rotates.
Then irimi nage becomes complimentary(sp?) to koshinage.
I could be be wrong, I'm no expert....
I believe that koshinage can bedone on any 'attack', but maybe the most simple to start with would be a kote attack from behind on both wrists.