Yellow can mean fear or cowardice, but it is also a color. Sunlight, summer, warmth, daffodils, spring and tulips.
This watercolor by Helen Burling Ottaway is from 1999 and my daughter chose the mat. I love her choice, the orange picking up all the oranges and yellows in the painting. Orange would never occur to me, but it is wonderful.

Beautiful watercolor — I know it isn’t, but it’s very similar to a scene in the mountains outside San Diego where I used to hike.