You could choose one of the newer masonry wall products that look like stone, or paint traditional concrete block in a soft natural color to enhance the landscape. A buffer of dense, fast-growing evergreens can make a difference, too. A variety of low-flowering shrubs would be especially pretty. If your yard is large, redwood trees could be planted at the property line, and then follow with lower plantings in front of them. The soothing sound of running water distracts and camouflages street noise.
Wind chimes are a good idea, too, to add distraction.
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