Ever since the gold one popped up on me, I've been getting almost all gold from every daily chance, except on the Games section. And sometimes it's a hundred or 75 gold, a pretty good amount for daily chance. Maybe the gold color means you're more likely to get gold.
Gold is the +2 to your chances, for logging in 6 out of 7 days. It actually improves your chances, like, a lot. I got like eight caches during the 12 days of Christmas when I was running through my mules for freebies, four ggb and just a flat 10k once. Plus a ton of the new DC items.