Here's a quick way to create instant hat bling for any occasion. I take my inspiration from all the crazy hats worn at Kate Middleton's wedding (go BIG or go home, right?).
The best part about my method of accessorizing hats is that it's instant. All you need are two super magnets and any fun object you may have laying around the house. You can go bigger and better by adding netting, ribbons, or feathers. And you can go vintage, modern or surrealist. The options for hat bling are limited only to your imagination and to things that weigh less than half a pound.

Step 1: The Setup

Position a super magnet on the inside of you hat where you want the bling to attach on the outside.
Snap another super magent onto the outside of the hat.
Attach anything metal to the outer magnet. These are the things I used here: a broken necklace, a pair of scissors, a handfull of paper clips, a Christmas tree ornament, and the inner guts of my steampluck lamp.
Not shown here, I also used a lid from a soup can (a Warhol inspiration).
Optional: hot glue the outer magnet to anything non-magnetic, and you're increased your options exponentially.

Step 2: Bling Your Netting

You can add instant BIG to your hat bling by bringing in netting. For this instructable, I took a circular piece of black netting, drew spiral shapes around the edges with glue, and sprinkled black glitter over the glue to create a gorgeous accessory for the other bling components. To use the netting, fold the circle in half, then in half again to form a cone shape, then scrunch up the point of the cone and use the magnet to fasten it to the hat.

Step 3: Go Big or Go Home

You could wear the netting alone, but the magnet will show, so I recommend adding any one of the other pieces of bling you have to cover the magnet.

Step 4: Bling Your Blouse

The very same bling you use for your hat can go on the outside of a top, a jacket, a scarf, your cheek, etc.
Now that I've shown you basics of magnetic bling, go forth and be creative with bows, feathers, or whatever else you can get your hands on. Have a Merry Christmas and a Happy New Year!