Re: Cost of decor- stage/ aisle/ centerpieces/ lighting
well they’re a bit typical but that doesn’t mean they’re not beautiful 
if you want to vary things, why not use the same bowl but instead of rose petals floating on top, wrap two or three red or maroon calla lilies and lily grass around the inside of the bowl and then fill it with water, and float a candle on top? that also looks very pretty. something like this… http://www.stem-florists.co.uk/Large%20Corporate%20Photos/Calla%20lily%20goldfish%20bowl.JPG
you don’t even need the water if you don’t want to.
or you can place a tall narrow candle holder (same height as the bowl) in the centre of the bowl with the wrapped calla lilies, and put a smaller votive inside the candle holder so there’s no danger of the flowers catching fire. the candle holder could be clear or red glass and that would look lovely too.
try to buy your flowers wholesale, it will save you money! Google Search