My dad is retired now, and one of his greatest joys in life is his collections.  His favorite collection is the one that is composed of trench art, mainly from World War I and the years directly afterwards.  He specializes in soldier made items, but his collection has become so large that he is now expanding into all kinds of this artwork.  We were trying to decide upon a good birthday gift for my dad this year, and we knew that we would get something like this.  I got lucky when I found a website that has a great variety of just the things dad will enjoy.