We recently stumbled upon this quick and easy DIY. We love the contrast between the yarn and the real twigs as well as the fact that these dandelions won't wilt nor will they leave florets all over your house. Don't limit yourself to white yarn...we have a bag full of yarn that will add some great pops of color to our faux arrangement.
Canuck Craft posted the dandelion idea following instructions found at Poopscape Projects. These incredibly easy to make bundles of yarn would make a great project with kids or an easy centerpiece for an informal get together.