https://rebrickable.com - A LEGO database that shows you which sets you can build from your existing collection, also includes thousands of fan-submitted designs.
My adsense earnings are terrible though, I've always assumed because the site is more image heavy than text.
I don't show ads for every page view (only unregistered users), and click rate is more like 0.1%. Now I feel like I'm doing something very wrong... advice welcome!
AdSense RPM, which I assume is the same as CPM, was $4 for 2015 and for about 6 months in 2013 it jumped up to $12. Would be very nice if that happened again.