Remove the stem and seeds from the bell peppers. Cut bell peppers into long strips. Cut the cucumber into long strips.
Create the widest layer of the tree by arranging the yellow bell pepper strips vertically along the bottom of the serving board.
Arrange the cucumber slices partially overlapping the yellow pepper strips and slightly inward to create the shape of a triangle. Follow with red pepper strips, orange pepper strips and snow peas.
Arrange the tomatoes in a triangular shape on top of the "tree".