Putting disposable cameras on your wedding breakfast and evening tables is not a new idea. But I love the idea of giving guests a challenge card in order that they capture images on your behalf. Easily printed for yourselves, your challenges can be personalised and different for every table if you'd like.
13 Wedding Cost-Cutting Ideas For Everything From Photography To Catering
. I LOVE breakfast for dinner, and I think it can be done delicately enough to be tasteful at a wedding, especially in an outdoor setting which is less formal. (This link is actually about budget cutting ideas)