I am an Ocotber Bride and I am having some trouble picking colours to match my flowers and I am hoping some suggestions will help.

My flowers are autumn themed (deep yellow, dark reds and burnt oranges), these will be used for the centre pieces and possibly the boquets.  Our venue is sort of rustic, overlooking a lake with sage green walls, floor to ceiling windows and alot of oak (trim and chairs).  I was thinking green, but i don't want my bridesmaids to match the venue and then i was thinking dark purple, but i am not sure how that will look...I really need help....any suggestions?