You may have heard of the flip-flop-man who runs up to 6500 miles a year... yep... in flip flops! And, at 67 he is 5 years older than me!
I decided if he could do it, I could do it. Of course, I probably weigh twice what he does, but why not try??? I ran a couple of miles in my flip flops and finished the 5k barefoot (which I often do anyway). I hated it! I constantly felt like they were going to fall off my feet and I kept catching the front edge and slightly tripping. I gave up on that and just enjoyed my KSOs until they wore out.
I have made quite a few pairs of huaraches from the scrap conveyor belt material I mentioned before, and just could not get over the thought that the flip flops should work! After trying several tying patterns similar to the Invisible shoes method to make them "slip offs" they looked more and more like flip flops with the heal tied up... so... duh... I went to the cheap store and bought a $2 pair of flip flops and a pair of 36" thick shoe laces. I evenly threaded the laces under the sole up through the back two holes. I put on the flip-flop, did one overhand knot behind the heal and then tied a shoe tie knot in front of the ankle. I tried them out and they felt great with no feeling of having to hold them on.
The original flip-flops I tried were really cheap and the hard stiff foam deteriorated and compressed very quickly. By the the 30th mile they actually hurt my feet more than running barefoot on gravel! So, next I tried some expensive flips with some contouring. They felt like wearing a pair of bad running shoes! yuck! Finally I found some very thin flips (I think at Payless Shoes?) that were about $10. They are very flat, very thin (not 10mm thin!) and very light. They also have a pretty good tread pattern on the bottom.
So far, I have put about 35 miles on them and the soles do not show much wear at all. Maybe I will not be paying $100 for non-shoes again! I love the fact that my toes are totally free to flex and feel the breeze! They also make quite a conversation starter at work when I run in! Here are a few pics. Let me know if you try making a pair and how they work out for ya'... OK?
Conveyor belt huaraches 
Invisible shoe type tying 
my try at slip on huaraches
Flipuaraches top view 
Flipuaraches sole view Remember, I am just barely running...
