The Los Angeles–based designer Mary McDonald is known for her sophisticated interiors, which often combine bold patterns, Indian influences, chinoiserie, and modern lines. Now she is bringing her signature style to rugs and fabrics. Her rug collection (priced for the trade from $43 per square foot) for Patterson, Flynn & Martin ranges in style from simple geometric patterns to more elaborate designs featuring fretwork and Art Deco influences. Materials for the 18 rugs include hand-knotted Tibetan wool and …