Agreed that whatever can be done to limit the inherent silliness of that alcove is warmly welcomed - quite regardless of the details of the artwork there.
I mean, that recreation room there is a vast, public space that offers very little privacy. Not very recreational as such, come to think of it. The five-image display is at the very center of attention, between the turboshafts on the biggest wall of the space. It's heavily framed and inset in two dimensions - you enter it by descending a few steps. It's a goddamn shrine! Dedicating it to the worshipping of five black-and-white pictures seems like criminal waste.
Multifunctionality and malleability would probably be the overriding feature of this recreation facility. If needed, one could arrange for team sports there, or have major public displays like Kirk's speech, then subdivide the space to more intimate playing areas or picnic spots or venues for art performances. The shrine should have multiple uses as well, then - perhaps including religious ceremony. Physically, it would remain a centerpiece no matter how the spaces were rearranged, so the varying uses might have to reflect that.
Showing the histories of various Enterprises would probably still be a good example of what that alcove does. Being inset that way gives the users some auditory and visual privacy - not enough to protect them from attention, but enough to allow them to enjoy an informational audiovisual representation. With five viewscreens in subdued lighting, and probably a good surround system for audio, yet with standing room only, the little "home theater" would probably best be suited for assorted short infomercials, perhaps mainly catering for the various visitors to the ship.
Timo Saloniemi