Make cement cloth planters. Approximately a water/cement ratio. Add drainage holes in the planter before it completely hardens to prevent cracking. You may also want to apply a couple coats of cement sealer after the planter is dry.
great outdoor project for spring or summer is to build a retaining wall. Retaining walls are used to reduce soil erosion, but they can also be built to create a pretty flower bed. - Flower Beds and Gardens