Finger Foods
Part of what makes a wedding fun is socializing, and with professional wedding photography you want to get pictures of the crowd being social. Finger foods allow people to be social and mingle while snacking or eating. Great ideas include mini pizzas, sliders, canape, fry cups, dim sum, and miniature food of any sort. If you can pick it up with your fingers without making a mess then it's perfect – that's the only rule. If you're doing a sit-down meal this is a perfect appetizer that lets guests mingle while the wedding photos are being done after the ceremony.
One of the coolest pairings I've seen was a combination of finger foods with a miniature drink. Think a cracker with caviar paired with a shot of vodka.
There is a danger with this. You don't want your entire menu to be mini sandwiches and snacks unless you're only doing cocktails at the reception. A wedding reception that is catered and is an actual reception will have guests expecting something a little more substantial to fuel their dancing and drinking for the rest of the night. The inverse of having too many courses and big foods, no one wants to sit at the table all night and if your guests are starving they're probably going to go get food elsewhere before the night is over.