Concrete Concrete paving is a versatile and cost effective option for garden paving. Concrete mixture is usually mixed with dyes and then left in a mould, these molds can even be made using real paving slabs to mimic natural stone more accurately. The slabs are then vibrated which gives them extra strength and are left to dry, this process is called curing. Sometimes different aggregates and materials are added to create different textures, some of which are made from reconstituted slabs. Because of the way concrete slabs are made the design possibilities are endless. Straying away from a regular concrete slab some manufactures mimic natural sandstone and limestone or even wooden stepping stones.