Reuse Deindexed PBN Domains?

I recently had 20 of my pbn domains deindexed by google. Is there anyway that I could reuse them as they had quite good metrics and it would be ashame to just let them go. I was thinking maybe redirecting them to parasites or tier one web 2.0s.

Maybe I could build them out as money sites and get them ranked in bing/yahoo

Maybe I could use them as a PBN for ranking sites only in bing/yahoo


Any suggestions? (apart from the obvious 'forget about them' suggestion)