Cost. The price of pavers depends on what kind of material you're using, how that material has been treated, if it's colored, and how thick it is. Below is a very general price range of pavers, divided by the more common material choices:
Concrete pavers: $5 to $10 per square feet
Brick pavers: $5 to $15 per square feet
Natural stone: $10 to $30 per square feet
Maybe this is stretching the idea of a mosaic a tad — but then again, maybe not. Make sure you have a friend to help if you do a flagstone patio of this scale (those stones are heavy!). Actually, make sure you have a friend helping no matter how big the stones are, and tell them to bring some wine. And knee pads.