The option always exists to DYE the tights....but I hate Capezio's nylon tights anyway. My suggestion to you is to check out Museum Replicas online shop. they're a medieval/rennaisance weapons and costume shop...they offer tights for clothing in many different colors, and the fabric is GREAT. Thin, tight, comfortable, and opaque. I'll add their link to the tights page. I think you'd be happy with these.
http://store.museumreplicas.com/cgi-bin/www11650.storefront/474764134/Product/View/9229&2D1--Aaron