Many people like the blue tinge of Colorado spruce. It has a pyramid shape and stiff branching. Ash brown to gray brown. Dark green to greenish blue, stiff and less than an inch long. White spruce has a good natural shape.
Needles have an unpleasant odor when crushed.
Good, but keep indoors for no more than a few days. Choose a location that will be cool and mist regularly or run a humidifier nearby. Living trees are a permanent memento of the holiday season, but they're a challenge. If kept too long inside a heated room, the tree will break dormancy. Then new growth will be damaged when the tree is moved back outside after the holidays.