Spread newspapers over the work area.
Select assorted, potted plants in 4-inch containers. Choose shade-loving plants that can tolerate mild neglect. Carefully remove plants from their containers. Keep soil and roots as intact as possible to avoid shocking the plants when they are transplanted.
Add pebbles to the shallow dish, spreading them evenly to form a bed about 1 inch deep. This will provide drainage for plants and help prevent roots from rotting.
Cover gravel with a layer of potting soil about two inches deep. Stand plants upright on top of the soil, spacing them about two inches apart. Arrange the tallest plants in the back of the arrangement. Position medium plants in front of them with lowest plants closest to the front. This will make all plants equally visible.
Spoon additional soil over the arrangement until you completely cover the roots. Fill the spaces between plants with additional potting soil. The container should now resemble a miniature garden.
Add commercial fertilizer to the arrangement, whether it's liquid, beads or spikes.
Cover the soil with a layer of sheet moss. Place moss between plants and over open spaces. Every few inches, insert a florist's U-pin to keep the moss in place. Push pins deep into the moss and soil so they aren't visible. Not only will moss provide a lush, green covering, it will help soil retain moisture in a potentially dry office.
Moderately water the office garden once a week. Soil should remain damp but not soaked.