Another option is to situate a wall graphic on the wall behind your home entertainment room's primary seating; the large presence is just as effective at diminishing the presence of nearly any HDTV. A pair of resources for browsing wall mural options are:
Surface View offers a huge collection of wall mural imagery, ranging from kitschy, to photography, to sophisticated art artifacts. We've always loved the Lady of the Orient and could imagine it working in a home office environment also.
Murals Your Way's catalog include a solid selection of nature-themed wall murals, categorized by Forest, Garden, Trees, Natural Landscape, Water, further organized by seasonal scenes. Science and sci-fi lovers could decorate a home entertainment wall or home office with one of 156 space/astronomy themed murals. Carl Sagan would approve. Or how about a 7ft - 52″ x 78″ Circuit Board print?