

I never did get around to making that tutorial video either, but I did come across these fabulous blogs that will help you (if you are so inclined) in making a rag rug for yourself!
Rag Rug Cafe - Great site with videos if you don't know how to crochet but would like to make a traditional rag rug using the toothbrush method
Moda Bake Shop - How to make a braided rag rug - super easy!
Craft Stylish - A fabulous blog & post on how to crochet (or knit) with fabric!
Enjoy ♥
UPDATE:
Here is my rough pattern, ymmv! I used a Boye size Q 15.75mm hook and my fabric strips were about one inch wide.
dc= Double crochet
Chain 4, join to form a ring
1st round - ch3 (acts as first dc) 9 dc crochet in the ring, join (10 stitches)
2nd round - ch3, 1 dc crochet in the first stitch, 2 dc in each of the other stitches, join (20 stitches)
3rd round - ch3, 2 dc crochet in the first stitch, 1 dc crochet in the next, repeat, join at the end (30 stitches)
4th round - ch 3, 1 dc crochet in the first stitch, *2 dc crochet in the next stitch, 1 dc in the next stitch, repeat from *, join(40 stitches)
5th round - ch3, 1 dc in the next 2 stitches, 2 dc in the next, *1 dc in each of the next 3 stitches, 2 dc in the next stitch, repeat from *, join (50 stitches)
6th round - ch3, 1 dc in the next 3 stitches, 2 dc in the next, *1 dc in each of the next 4 stitches, 2 dc in the next stitch, repeat from *, join (60 stitches)
7th round - ch3, 1 dc in the next 8 stitches, 2 dc in the next, *1 dc in each of the next 9 stitches, 2 dc in the next stitch, repeat from *, join (72 stitches)
8th round - 1 dc in each stitch around, join fasten off, weave in ends
If you want a bigger rug, repeat rounds 3-7 until you gt your desired size, always end your rug with a single row of dc/hdc/sc (or any decorative stitch) all around.