Fill the bottom of the clear glass bowl with a pound of marbles. Choose marbles of various colors and designs to create a pleasing appearance.
Fill the glass bowl about halfway full with clean, cold water.
Measure the depth of the bowl with the tape measure.
Cut the stems of the roses to match the measurement of the depth of the glass bowl.
Arrange the roses around the inner wall of the glass bowl, evenly. Keep them closely together, not letting any of them fall to the center of the bowl.
Place the lotus blossom in the very center of the bowl. This not only keeps the roses aligned against the inner sides of the bowl, but it adds an accent of color and texture to offset the roses in your rose bowl.