Last week I was awash in flowers, as you saw.
(I did check in with my expert floral adviser before committing myself to this project - thanks, Kris!)
I purchased one case of floral foam, 12 white ceramic containers from Ikea ($4.99 each), a few dozen bunches of flowers from the flower market. I picked out simple mums (I think?) and yellow billy buttons. Total cost: $200 for 12 centerpieces, about $16 per table.
All I did was arrange floral foam in the bottom, soak it with water, and pop the flowers in, keeping them tightly clustered. Simple, yes. But so very time consuming. I estimated this would take a couple hours, but it ended up being more like 8 or 9 hours. Luckily, we have HBO (I re-watched the entire season of True Blood, plus a random movie). I sustained only one clipper related injury, which is pretty good for me. It involved a minimum of shrieking and whining to D as he tried to wrap it in gauze.
If you're thinking about doing your own flowers for a wedding, don't assume it will just take a few hours, unless you are doing something really, really simple, like sticking a few flowers into mason jars. At the very least, have 4 or 5 friends over to share the work and cut down your arranging time. And order pizza. Flower related stress increases exponentially when you aren't properly fueled.
Tip - don't think you have to stick to the vase section when you're making flower arrangements. The 8" Smarta dishes were cheaper than most of the vases I looked at and they are oven safe, so when we're done with the party, we'll have some useful bakeware and/or serving dishes.