I have been playing around with Polyvore a little bit, and just received the new Ikea catalogue last week! I finally got the chance to scour it for ideas, and there is some nice stuff in there. I won't vouch for the quality of the items, but they've got the look down pat. Here's a fun little throw-together of a living room with all Ikea furnishings:
Total cost before tax: $2897 (my gosh Ikea is inexpensive).
You can see more of my Polyvore fun on my account: http://interiorgroupie.polyvore.com/