Maybe you got two that are blue phase? I love the blue phase.

Also, lots of things can influence colour, like temperature or mood. One of my blues stays mostly brown throughout the day, then is more green at night. The other almost always stays the nice blue colour.

When it comes to feeding, I think the open front is better (though crickets find a way to escape! Days later I'll find one on the floor of my apartment. Pretty easy to catch though), especially when it comes to hand-feeding mealworms. Plus if it wasn't for the open front, Luigi wouldn't have so much fun jumping out of the front onto my couch or on me.