How to decorate old fence posts concreted into the ground?

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I have several old fence posts and a gated larger post that I need some help with
My grandson and I have planted junipers and Altheas put down weed cloth and mulched however I need something for borders..that doesn't require digging
and I need a new look something added to fence posts as they are concreted into ground.......the picture doesn't show the 8 ft posts however they are along a 36 foot area and the landscaped portion is not fully showing as it is larger5 ft wx36ft long...... 4 posts
q how to decorate old fence posts concreted into ground, fences, how to
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