You could use a tone on tone effect...different types of yellows. Or use the complimentary colors to the yellow, which would be colors within the purple/violet family, as well as colors in the Blues and reds.

Black white and yellow are amazing together. Embrace the yellow walls and add in graphic prints to make your room pop! Enjoy and have fun.

Thanks!

Here is a bedroom with light grey and yellow for a softer look.

Yellow with blue and white is a classic and cheerful color combination.