Cut out a piece of cardboard the size of the center of the hubcaps. Place in center of your hubcap.
I love the orange and blue flowers but not the pink. (Looks better in picture). I used paint I had on hand. The pink was fluorescent, and it did not cover as well. I think I will buy a regular color of pink and redo that flower.
How do you like my hubcap yard flowers? I think that the stems and leaves are to small for the flowers. What do you think?