I like all of them together, depending on what you are making. Did you use the 'plum' because of the colors in the leaf fabric on the left? You could use the plum as the 'standout' fabric, but you already have the darker orange one for that, and the color palate centers around the orange/yellow line. Otherwise, I too would take it out and add a more subtle green similar to the leafy vine one. Another reason I would take out the plum and use the orange as the bolder is because orange is in the black fabric. And you want to keep that one I would hope. This is going to be a wonderful end result no matter what you are making.