Hoosier Orchids one year did a complete 25 sq ft exhibit at a Illinois Orchid Soc show where not one of the orchids was in bloom. All had beautiful foliage, and textures. The exhibit I believe won a show trophy and several ribbons. So yes, orchids may be displayed for their foliage, without flowers. Most show schedules have a category that this can be squeezed into. Obviously no AOS flower quality awards can be granted to plant not in bloom, but JC and CHM can be written on foliage merits. So thre are AOS awards available for foliage.
Hoosier's display included several jewel orchids, Paphs malipoense, armeniacum & other parvi's (none in bloom) Sobralia, Lycaste, Stenorrychos, Maxilaria and many other intersting foliage genera. It was very interesting.