A couple years ago I took the Fundamentals of Interior Design class in my program. I remember that my instructor had a list of five basic elements that every room should have, and that one of the elements was "something alive" - flowers! I believe that this is true. Flowers are inviting and can bring so much life and cheer to a room.
There are so many wonderful varieties of flowers that you're sure to find something suitable for your room, whatever style it may be. Take a look at the chart below for some tips (originally this was a chart meant to help with floral arrangements in wedding planning, but I think it's pretty informative in general!):
My favorites are peonies and hydrangeas. What are yours?