Can you provide some more information about your question? A photo of the room perhaps?

With pearlized tufted furniture you can go ultra modern using white and perspex and glass. In this case, a glass table, a white shag or textured rug underneath a glass coffee table could look very exciting - you can then add a shot of jewel red cushions and some accents to give it a focal point.

something round, or that has curved lines. the last one's the most $$$, but oooh, it's pretty.

Perhaps a large round table might mean a rug is not at all necessary. It could be a metal tray table, or carved wood like Rebecca Mitchell Interiors illustrates. Ideas also to consider, using multiple tables can be found at http://www.houzz.com/multiple-coffee-tables. I also agree with comments above that some color is needed on the walls. You could then hang round mirrors, or an unusual curved shape like RMI shows above.