Rugs that have similar designs in them that matches the rest of the furniture or colour patterns of the walls would be a good choice.  The thing about rugs though is that they can also be used to add colour to a room.  Often people are looking for ways to brighten or liven up a room that is dull or darker in appearance.  Cheap rugs offer you the ability to bring in bright colours and styles to a room without having to spend money on painting the room or the time that it would take to complete a project like that.  Another great thing about cheap rugs is that they are portable so if you are renting an apartment or home you can take the rug with you when you leave.