I love hydrangea.
They look stunning in a wedding bouquet, and make a decent centerpiece on their own (in narrow vase).
I love that I see them so often in weddings, but also know that many brides lament the cost of them (florist markup can be quite high).
I was perusing costco.com, as I often do, and found these: 60 stems of hydrangea for a mere $129.99 with shipping included!
Though you can’t choose the actual color (they’re “mixed”) — one or two bunches of these would leave even a picky bride happy.