I hope your weekend is going well!
I had offered to bring some centerpieces to an event we're attending this weekend. I really didn't have anything specific in mind. Thankfully, my parents have bushes and bushes of the most beautiful hydrangeas and were willing to share!
I used two extra large white wood flower boxes we had on-hand (one of them is shown below). I lined the bottom with foam and began sticking stems into the foam until it was nice and full... and until I liked the shape.