Some of my favorites are Hammock, Lights Out Asia, EF, The American Dollar. Some other bands that I love are Anathema, M83, Porcupine Tree, Opeth, Dream Theater. In case you don't know though, those ones tend to be a bit more on the heavy side, especially Opeth and Dream Theater.
Black, for sure. I'm pretty big on shades of purples too, orange and at times red. Blue might just be my second favorite though haha. Not sure why, green just doesn't appeal to me all that much. I definitely like it better than say... yellow though lol.