Flowers are great, but we really loooove plopping a little baby succ in there from time to time. Not only do they add a nice, contrasting texture, but they last as long as you can keep them alive!
If you don't already have a pot that you like, we suggest ordering your succulent arrangement in a large, opaque container. that way you can repurpose it as a succulent planter once your flowers have passed. Just remove the succulents from their bouquet sticks, plant them in well-draining soil, and place them in full or very bright sun.