I'm wanting to suppress weeds in my garden with creeping plants, and am wondering if I should get varieties of short plants for my garden so they spread to cover the entire garden so I can go around on it bare foot.
Well, you could consider using some form of bindweed. It is a common hardy "weed" that usually grows white or blue flowers. It can be a great ground cover and requires very minimal maintenance. It's roots usually grow about 2-3 inches below the surface and are incredibly easy to remove, they usually grow straight down as well.
Another option would be a plant like Bishops weed or what is more commonly known as Snow on the mountains. Unlike bindweed, Bishops weed will take some maintenance on your part.
Keep in mind that while bindweed will never grow more than 2-3 inches above the ground, Bishops can get around 5-6 inches tall. Also, please note, that unless your garden is a squash, melon or tomato garden (big plants, large roots) I would never suggest growing a creeping plant inside it. There is always a chance that without proper maintenance and pruning these creeping "weeds" will choke your garden plants to death.
There are a few problems with that idea:
Don't tread on any insects (e.g. ants) that will bite your feet.
Likewise, don't tread on any bird droppings etc!
The creeping plants won't stop at suppressing the weeds, they will also suppress your other plants when they are still small. If the creeping plants aren't strong growing enough to behave like "weeds" themselves, frequent walking on them will soon kill them.
They will also take nutrients and water away from your other plants.
If you really want to go this way, I suggest you change "creeping plants" to "grass". That might sound and look boring, and you will have to mow it regularly, but it won't have any unexpected bad side effects.
One idea that works is to use high-grade landscape fabric between the rows—18-24" (50-60cm) usually is wide enough. I use this myself, with ground staples holding the fabric in place. This is not a perfect solution by any means — if you live in a cold-winter environment, the staples have a tendency to frost-heave, and the fabric when wet can be slippery. I've also had issues with moss growing on it and some weeds coming up in the staple-holes. I don't know that you'd want to walk on it with bare feet, either. Still, it's better than nothing, keeps weeds from growing on the paths, and, because you're not walking between the rows, it keeps the soil there from becoming compacted.
In my garden, I keep the paths "two sword lengths apart" - that is, 6 feet apart. I'm tall and have a good reach, so this allows me to reach the center of each vegetable bed by kneeling on the path on either side of it.