I would sew rags of one color together like carpet rags, not lapping the ends more than necessary to hold them together.

The rug will be reversible, both sides being exactly alike when finished.

I should make the rug about fifty-three stitches across.

This will require about six and one-fourth yards of carpet rags, when sewed together, to crochet once across.

I think it would be wise to cut all rags of different weight materials before commencing to crochet the rug, so they may be well mixed through.