There was a day ~2008 when I was walking down 1st St SW after being away from Calgary for a few years, and the sun was reflecting off the podium of Colours such that a rainbow of parallelograms stretched across the road. It was the first time I thought to myself that Calgary is really changing for the better, and perhaps it was what got me interested in skyscrapers, skyscraperpage, and urban design design in our city.
I don't know if I can pick a favourite, but I might have to pick Colours for being a flagship of change, DJD for the integration of its use, a dozen low rises and historic buildings for their character, Place 10 for covering the tracks, 6th & Tenth for overall design, and Mount Royal Village for its anticipated effect on the community. I really like some of the plain, clean designs we've seen like Calla, Drake, and Amble/Maple. I'm also a fan of the modern walk-ups like Uno, Tribeca, and Ten.