Do you plan to knit or crochet it? Somehow, I can't picture either method being used to make a rug.

Ooops, forgot to specify -- crochet pattern.

I found the perfect one! it costs $4.25 but is the best money you'll ever spend on a pattern. SO easy to make!
http://www.etsy.com/listing/61790081/crocheted-dog-bone-mat-pattern?ref=sr_gallery_25&ga_search_submit=&ga_search_query=dog+bone+crochet&ga_view_type=gallery&ga_ship_to=US&ga_search_type=handmade&ga_facet=handmade

I've made about 20 of them!

Here is the page with a clickable link. That is CUTE!!!

-Babka

Here is a link that might be useful: Dog Bone Mat