Accent yellow walls are not usually a popular choice, as there is very little you can do to accentuate the color and make it pop. The 3 main shades of yellow are pale yellow, bright sunshine yellow and mustard. If your walls are pale yellow then your best choice would be to go with colors from the ice cream color palette, for example pale pink, perfect for a child’s room. On the other end of the spectrum, mustard would look good in a retro room with a 70's theme. Finally, bright sunshine yellow needs to be teamed with simple colors, such as white, as it will be the focus of the room.