Ideas/Pics for dining room in living room

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We don't have a separate dining room.  You walk in the front door of our house and the dining table space is pretty much right in front of you, past the coat closet and the living room space is to the right, all part of the same, big room.   I would love to feel like our dining space is a little more formal and separate but am completely clueless what to do to accomplish that.  Anyone done this before?  Have pictures? Ideas?

I'd take a picture of the space to show you, but it looks like DS's backpack and closet exploded on it right now.