Yard Decor Items for Animal Shelter (Craig and Washington,Lombard)

I work with dogs at a public animal shelter and I am in the process of developing mini enrichment stations all over the yard where we walk dogs. I am looking for novel outdoor items that dogs can explore for sensory enrichment. I am thinking things like wind chimes, spinners, medium-large resin or metal 'sculptures', pinwheels, wind socks, flags, whatever else might be fun or interesting for dogs to look at, listen to or otherwise interact with...maybe some s-hooks to hang stuff from trees. Things that are ugly or damaged are fine as long as the damage doesn't make it unsafe for dogs. Phase Two will include stuff like herbs to sniff and different surfaces to walk on, but we're not ready for that yet.