Oooh I can play this game!

Here's the tandem outer ring with bashguard on my Batavus Randonneur GL, 52/42/26T. The extra holes for the bashguard are designed to give a bit of extra stiffness but they can also be used to add a third chainring on here.



I plan to design a custom chainring around the Pro5Vis for a classic Gazelle bicycle.


One other nice custom design is the one by GrandBois, with it's own interpretation of the compact double 46/26T.




And don't forget BespokeChainrings on eBay. They used to make very cool Solida chainrings based around this BCD size: