You will need: 4 beds, one block of concrete that is the same color as your bed, 3 fences, and one flower pot.
Step #1: Place the tree fences were you want your umbrella to be. Then place you concret on the top fence like in the picture bellow.
Step #2: Place a flower pot on top of the concrete and some block all around the top fence like this. You will break those blocks later.
Step #3: Place your beds in a circle like in the photo.
Step #4: Break the blocks under neath the beds.
Now you have a minecraft umbrella!!! :D