Achieving a "carelessly-strewn-about" and piled-on display look for your jewelry is easy. Anthropologie makes gorgeous bowls that are too pretty to eat from and thus perfect for putting jewelry in. I recently purchased this tree stand from Urban Outfitters to hang all my necklaces after eyeing it for quite some time, and I love it. Mannequin dress forms, are also a really chic and interesting way to display accessories (necklaces, brooches, scarves, hats) and cheap ones, like this one, are easy to find.
Image Sources: The Coveteur, How I Met Your Style, Cupcakes and Cashmere