My son has been a Metallica fan for decades. He is 39, but has been permanently disabled since just before his 19th birthday. He lives at home with my husband and me, and for about 15 years, his room was decorated with 49er fan "stuff," but when we recently put new carpet in our house, we re-decorated his room. With his new plain walls, we needed something new besides 49er posters and Playboy calendars. When we got the idea to put some sort of posters or art relating to all the music he loves, h...