DIY Dining room table with 2x8 boards (4.75 each for $31.00) from Lowes This is the coolest website!!! I agree! If you love Pottery Barn but can't spend the money, this website will give you tons of inspiration.
paint a piece of wood (could paint a solid color, or paint a design/pattern like this one), sand and distress/age the corners, then attach a regular picture frame on top. These are about $150 in gift/home decor stores.