Do you know how are those nice flower arrangements made?

They are usually not factory made. It is hard work. Each flower is different, each client has its own wishes, and each arrangement is (or should be) unique. In one of my wife's previous lives she was a floral designer. Yes, it was B.S. (Before Seattle), and she even has a certificate about it somewhere.
Today, she brushed up her old skills and made an arrangement. It is slightly on the big side, as you see it here only partially done, and it is nice. She can still do it, and I just love watching her during the process, when she goes like a painter around the artwork, adds a bit of color here, moves things a bit over there, and stands a few steps back to critically watch her own work.

She looks lovely during that process, and I got many nice shots from this flower session. In others you can see the arrangement better, or her face better, but this one shows the process, half done work, focus and those never-ending adjustments during the work.

Shot with ISO 1600 to compensate for dim dining room light and her movements. F/4 to keep flowers and her sharp, while painting behind is just blurry enough not to distract from the arrangement.