Use birch tree slices as centerpieces for reception tables. Fill vases with flowers of your choice with photos on top of the slice and small candles around. Or place a few mason jars with candles inside on top of the slice with photos around it.
This is how the mason jars with floating candles and main bouquet in the middle would look. (I like the this mason jar idea and the flowers arrangment however incorporate the dark purple and lighter lavender)