Kidney pavers can be used for walkways and paths.
Low profile (about 2”) rubber base board used in interior applications, with rounded edge up, works but any other flexible material such as garden edging could work also.
Make say three individual loops of 7’ foot lengths.
Place plastic sheathing on a flat surface and position the three loops one next to the other. With the right hand grab loops 2 and 3 and with the left hand grab loops 1 and 2. Notice that as you move your arms back and forth the three loops still follow each other’s form. Very convenient since you could layout your whole walkway with more loops and the nice thing is that as you adjust a loop to your liking the one next to it will also follow form.
Good face down:
By making pavers over plastic with the good side at the bottom, color tiles can be positioned and then the ready mix concrete poured on top. With this method the concrete will have a very smooth finish unless some sand is sprinkled over the plastic sheathing.
This process will make the pavers mirrored and flipped since the good side is the bottom. Careful planning is a must if you are making a walkway from point A to point B this way.
Make three pavers and as two are removed, always leave one behind to form the next new paver. This also allows for checking and direction adjusting.
Good face up:
The second way of doing it is to actually put down all your loops at the same time on site. This will make it easier to visualize the path from point A to point B and adjusting to the liking is easy. One might want to use some occasional stakes on the outside of the rubber loops for better control of form. The pavers will be rather thick and there is an opportunity to apply some wire mesh at the bottom for reinforcing. Apply 1/3 from the bottom. Pour the concrete and smoothen with a trowel or long piece of wood.
At this point you can inset tiles, flat rocks, broom finish or give it the creative texture desired. You could actually create a stamp and gently stamp each individual paver.
When making the pavers on the side, place the pavers over packed sand at installation. When making them on site a little sand at the bottom will not hurt either.
Finally, after placing the pavers sprinkle sand in between the cracks and resort to the aid of a broom. Hose down with a gentle mist and repeat the sand application.
Down the road another application of sand might be needed.