Most quilt shops buy their patterns from big distributors, so rather than try to sell direct to quilt shops, you may be better off selling to the distributors who sell to quilt shops. If you're writing patterns for specific fabrics or feature some specific fabrics, try going to the distributors that sell those fabrics. A few of them who deal a lot of patterns are Brewer Sewing supplies, Checker Distributing, Petersen-Arne, EE Schenck Co. There are lots of other ones.