The big C metal frame was from an event. We were about to discard it, but feel 'sayang' to do so.
I still put it in my balcony garden until one day I saw a tutorial of a botanical project that sparked me the idea to reuse the metal frame.
So I got some gunny sack to wrap the bottom (I sewed it with thread), put in soil and it's done.
Then I cut some of my existing plants to grow in their new 'house'.
Hope it works well!