I know there are pink porcelains, but are there any pink composites for restoring Class V lesions so that they appear as gingival tissue rather than very long teeth?

Yes. A composite product called Ameris Gingiva (VOCO America, Inc.) comes with three different shades of opaquers and a natural gingiva shade to create the effect of gingival tissue rather than long teeth when restoring Class V lesions. The opaquers are a flowable consistency and the natural translucent gingival shade composite is sculptable. It can be used with any bonding agent.