Final answer:
The 7th room can be described as 'luminous' with window panes of a 'vivid' color, reflecting the varied descriptions offered in the provided text excerpts.
Step-by-step explanation:
The sentence '7th room was _______ with window pains that were a ____ color.' can be completed using context from various provided text excerpts. Based on the descriptions, one could infer that the room might have been described as filled with light or depicted in various states from the given literature.
A matching description could be '7th room was luminous with window pains that were a vivid color.' This incorporates a general sense of atmosphere and color from the excerpts provided, although the specific color or feeling of the room can greatly vary depending on which excerpt is being referenced.