What is it about the color yellow? Florists know that yellow flowers make the cheeriest bouquet for those who are sick or sad. While red infuses energy and blue calms us, yellow brings out the artistic creator in each of us. Use yellow/gold near conversation areas to stimulate creative communication and imagination. As in my case above, yellow stimulates memory, so if you want to model a bygone era or remember a locale you visited, lightly intersperse your railway with yellow objects and plants, like a spice.