How to enhance the blankness of underneath of wisteria arbor?

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I took this photo from the upstairs of our house but it does show the relative newness of the fence backing this space beneath the wisteria arbor. In time this will darken but since it is now the focus (esp as seen from back yard) it seems boring. We have a patio (to the right) under a grape arbor, so don't need seating. Barely visible in photo is an angel over a small fountain/pond. I've been wracking my brain. Any good ideas? width of space is maybe 8 to 10 feet, depth of ground about 4 feet. Soil very stoney and root bound.
q how to enhance the blankness of underneath of wisteria arbor
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