Grey cinder blocks are boring. Go with a colourful one
Because you would not find a coloured cinder block in a home improvement store, the only thing you can do is pain the blocks.
Get yourself a bucket of paint, a brush, and an open and creative mind. The sky is the limit when painting is in question.
These patches will invoke questions and praises
In my country, it is popular for the deceased to be buried in cinderblock patches as depicted below.
In other countries, however, these cinder blocks are a testament of the creativity within you.
Make sure to plant colourful plants to counter the rather boring blocks, though.