Your best bet for patio stone is 1/4″ to 3/8″ decorative pea stone. Lowes and Home Depot both carry it in bags. Once it is washed it is very nice to look at with a lot of quartz in it usually. The stone is roundish and easy on the feet. Crushed stone generally has a lot of sharp corners, so I’d stay away from it. If you intend to put a bistro table and chairs on this section you might consider some cut blue stone rectangles or squares. They come in a variety of thicknesses starting at about an inch. This would give you a nice base and you could fill in the voids with the pea stone. Don’t forget to put a couple layers of landscape fabric under everything to help control the weeds that will come up no matter what you do. Keep a spray bottle of Ortho Weed Killer handy for when they do.

Good Luck. If you have any other questions don’t hesitate to ask.