I aged a few bottles over a year ago including Chimay blue, Westvleteren 12, St Bernardus 12 but the one that was a stand out (for me) was the Porterhouse barrel-aged Celebration stout (11%) - it was fantastic after a year!
I would highly recommend putting that on away in a cool dark place. I use an old stone shed that is cool and dark (secret location!).
I did try aging some Orval about 5 years ago but don't think they benefitted that much from the year I gave them.