We have on several occasions found collards being raised as an ornamental plant. This is usually done at a residence, and it seems not so different from the use of certain kales. Of course the kale we usually see used in this way has a very unique and sturdy rosette form with pink central leaves – more striking than a collard plant!
Here is a friend of a friend using collards to decorate his law office in Seneca, South Carolina! Thanks, Julian, for permission to share this, and thanks, Frank, for making the connection for us!!