Kari said easy and these are easy. I have been making these for years and have no idea where I first saw them. This is a great way to use all those odd buttons. They are a great project for kids. (Girl Scouts). And there isn't much clean up. I have tied them on gifts or here I just stuck them in a small vase. These sit on my kitchen table and never wilt. (Maybe a little dusty)
Start with a variety of buttons. Any size, shape of color.
I use unwrapped floral wire you don't want the wire to thick that it won't go through the button,but you want it strong enough that it will stand up.
Start by folding the wire in half and treading it through the button. Sliding the button all the way to the end of the wire.Here you can use a shank button. Add a couple of more buttons. Twist the wire a couple of times. Add the next set of buttons. Vary the size shape and color.