I have some nice green metal and platic chairs along with a green plasic table. Usually though get some nice metal chairs and a metal rimmed glass table it looks and feels fine. (metal because it lasts longer through more things)
We have some plastic & metal patio furniture that works great, but be sure to weight down your umbrella if you get a lot of wind on the outside of your house....we find out the hard way that our umbrella has wings
Every patio or deck requires some deck furniture to make it functional. A table and chairs are the most important deck furniture and umbrella is also pretty important. The two best woods for outdoor furniture are either cedar or teak.
You should take a look at Hanamint patio furniture. They make products out of aluminum and wicker if you cant decide which style you like. There are 11 different collections a family member recently recommended this to me and I found a few pieces that work well with what I already have.