If you need a blockchain implementation....use Nxt.
You can easily create and asset/colored coin using eithe the Nxt AE or the upcoming Monetary System, so it's pretty much a complete package ready to go.
Nxt gets loads of stupid FUD on BTT, if you believe even half the BS round here then Nxt is Satan itself, but that's actually untrue, funnily enough.
I'd suggest that you take a good look at the main Nxt community forum:
www.nxtforum.org

Even if you have issues with investing in Nxt, everything is open source, and you won't need to make any heavy monetary investment to get a closed Nxt-based system up and running. The Nxt devs (+community) will be happy to answer any questions or give you some help.

Just for the last bit of shameless Nxt advertising: pretty soon, the Nxt blockchain will have been running stably and securely for a year ! Happy birthday, us!
Currently the Nxt network has an average of 270-290 active nodes at any one time, with approximately 2500 nodes in use.