I bought them this way always with the intention of painting them.
It took a long time to decide what colour I wanted. As they were to be placed around the pool, I wanted them to coordinate well. My paving is a dark charcoal, & the pool is turquoise, so I went with those two colours.
Once I got the grey painted on I was so relieved, as it became quite back breaking work. I didn't have a table strong enough to to put them on so I could paint at a respectable height, so I was bent over quite a bit. However it was so worth it once hubby popped them on the trolley & wheeled them down for me. We took a trip to my favourite nursery Rivers I bought some delicious Geraniums. I was advised they were green, bright, tough, & hard to kill. Perfect!! So in they went & I am so super happy with the end result.