So as an example: We have an area which is 14 ft x 24 ft. We have thought to use 2 different sizes of a patio paver in the design which are 16 inches x 16 inches and 16 inches x 24 inches.

I was hoping to be able to visualize what the finished design would look like before buying.

I know we can calculate how many to buy, but want to get a visual picture of the different layouts we could use.

Thanks
Julia

Make a bunch of scale models of the tiles in a graphics software - or powerpoint - and start messing with them.

Many suppliers have a series of patterns laid out pictorial in scale for you including random patterns for their paver dimensions. They also have different thicknesses depending on your expected loading (ex. driveways instead of patios).
Aloha

It has an image / map tracing function too, so if your patio can be seen from Google Maps you could trace it in SketchAndCalc to arrive at the area and perimeter.

Maybe try this:
1. Make a sample configuration of stones on the floor.
2. Take an overhead photo of the pattern.
3. Import the photo into a graphics package to scale and position, or simply print out many copies and position on the floor to get feel for the best configuration.