Saying "Free database models" to a developer is like saying "Free icecream" to a kid. I don't remember where I first saw this as it's popped up in a few places now, but this is an awesome resource.

I think you have to take it with a grain of salt, as I'm more heavily into DDD these days (not that I'm any good at it, but I'm practising). Still, it can do you no end of good to examine data models generated by a professional modeller. There would be tricks you could learn in there that could save you years of failures down the track.