What to do with some Metal Columns?

I have some metal columns (decorative posts) like you see on the front of a fancy house. There are four, each about 7 or 8 ft tall, and white. Two match. The other two don't match. So I have four columns in three styles. One column is about 10" in diameter, one is about 8" in diameter and the two that match are 6" in diameter.

I think they're beautiful and I'd like to use them in the garden somehow, but I'm not sure what I could do with them. I thought of sticking one here and there and using it as a vine post, but that idea doesn't really appeal to me. I have a privacy fence all around my gardens that I can grow vines on.

Have ya'll done anything interesting with some columns?

NancyAnn