Quote from : Harry Potter and the Half-Blood Prince Book

Fred, George, Harry, and Ron were the only ones who knew that the angel on top of the tree was actually a garden gnome that had bitten Fred on the ankle as he pulled up carrots for Christmas dinner. Stupefied, painted gold, stuffed into a miniature tutu and with small wings glued to its back, it glowered down at them all, the ugliest angel Harry had ever seen, with a large bald head like a potato and rather hairy feet.