Absolutely nothing. You don't see shin pads anyway. I'd imagine unless a player has a boot deal (which they d prob have to wear same make of shins as boots) they can where whatever they want as long as they're legal!
So I see the argus ran a story saying Clayton / Buldock / Ward are all signing but can't see a thread in this!? Any 'in the know' posters know if these are all done and dusted?!