Start with an old wreath. Mine was faded from being on our Southern-exposure front door (and looking a little 'blah').
If you don't have a drop cloth, cut up some paper grocery bags and use those as a surface protector.
Choose your spray paint: I picked a glossy red indoor/outdoor can from Lowe's.
Make sure to wear a mask when painting! My wreath needed two full coats (allow for dry time in between).
Let dry overnight, then hang and enjoy!