Accessories - Housewares - Finishing Touches - Dining Room Artwork

Hello! I'm currently looking to add some artwork to our dining room walls and need some advice. We recently painted the walls with two colors: a medium red on the upper portion, and a light soft yellow on the bottom portion, divided by a chair rail (the colors are echoed in the adjoining living area). The furnishings, including the rug in the living room all have a contemporary feel with clean lines and a bit of a geometric feel. (I love math!) My question is this: I'm wondering whether I should choose one large piece of artwork or choose several pictures in a set (and arrange them either in a square or diagonal pattern, etc.) for the dining room wall that faces the living room. I thought that perhaps one large piece would make the room appear larger and less cluttered, but I could be wrong. Any advice you can give will be greatly appreciated.

Thanks a million!
Betsy: