It is important to have a walking path in your garden for a number of reasons. It's a great way to create a design, other than with plants, in your garden. It shows you and others where it is safe to walk so plants won't be stepped on a crushed.
Last, and most importantly, the soil won't become compacted down when people walk too close to the plants. When soil gets compacted, plants will not grow as well since their roots will not get enough of the needed nutrients, water, and air.
Construct 13" square wood frames out of 2x4 pieces of scrap wood. Purchase concrete mix (there are many different grades and colors so be sure and ask your hardware dealer which would be best for your project), mix it according to directions and pour it into the frames. The frames should be laid on a flat surface with plastic under the frames.
Now for the creative part! Draw designs into the concrete. You can add mosaic tiles or bit of broken plates or colored glass. Make hand prints, flowers, vines, rainbows, write words like "Marilee's garden," "Welcome," "I love gardening," etc. into the stones. Have your child help you. Remove the frame and allow the concrete to dry overnight. Set the stones in your garden and enjoy!