You can use these for shelf brackets. They are plastic and you could paint them green to match plants. http://www.homedepot.com/p/EZ-Shelf-...-RSS/204815657.
As for sheets of PVC, you will have to check. Home Depot in my area doesn't sell sheets of PVC but you could look for a plastics store. They can cut and manufacture stuff for you. There is a plastics place by my house that will fabricate anything in plastic for you for a price lol. It's called Tap Plastics. Can see if they have one in your area.
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