I would love to see the Holmes House in person...
The Summer Room
Mycroft was talking too fast for John to remember what names he was giving to each room, but they had names like "The Spring Room," "The Summer Room", "The Sunlight Hall," among other things. John's favorite that he had seen was the Summer Room, with its sky blue walls, plush green carpet, embroidered yellow furniture, airy atmosphere, and painted pictures of Mycroft and Sherlock as children on the walls. He had paused to look at one, taking in a scene with an orange-haired Mycroft sitting with a toddler-aged Sherlock on the beach, looking happier than John had ever seen him.
Prompt is from my sister Magdalene, and it was "Seasons."