Get Pottery Barn pieces at Ikea prices.
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With a little wood stain and a miter saw, you can make the Lack shelf ($19.99) look like floating reclaimed wood.
Get the directions here.
Swap out the legs of any Ikea sofa.
It makes a huge difference.
Attach crown molding to the top of your Billy bookcases ($79.99).
This takes a little bit more work, but it will make your bookcases look built in.