Pavers are a great alternative to concrete.  They are 4 times stronger than concrete per square inch. This is due to the way they are made.  Paver mix is vibrated to remove air bubbles, mixed colors which are cooked in throughout the paver which makes them look great for many years to come.  Some benefits of pavers are -  the rich colors don't fade like colored concrete, they are placed and locked in to block weeds, if a paver becomes broken, stained or cracked it can be replaced with a new one without tearing out the entire project.  This product is more costly than concrete but only by about 20%, which means you get a far better longer lasting product for a small portion more than inferior concrete.