As much as you probably don't want to hear this, I think those domains are pretty much useless. I'm also assuming (possibly incorrectly) that you have just bought these domains for around $10 because they were available.
If the domains don't have any on-topic inbound links or authority behind them, then you can't really do much with them except start from scratch. If they do have some established authority and topically relevant trust flow, then that's a completely different story.
Keyword rich domain names are more of a hindrance these days than a help. One of the main reasons is that every time you acquire a naked URL backlink to your site such as www.citystatephotos.com, it already has the main keyword in it. This makes it very difficult to control your link anchor text ratios in the long run.
Google is all about brands now and not keyword rich anchor text domain names. Yes, those domains are perfect candidates for a churn and burn spam campaign but they're not the type of domain names that you'd want to build a long-term stable Internet presence with.
They're also no good to build a PBN's on either because they have no juice going to them. The effort required to send them quality link juice would be far better off spent just improving the quality of your original site.