Malibu Blue & Yellow?

I am getting married next year in May and my girls' dresses are Malibu Blue. My FIANCE wants to add yellow to the wedding colors, I am trying to figure out how to intwine the yellow into the wedding but I didn't want a bright yellow cuz I think that it would overpower the Blue... Does anybody have any suggestions on what I could use the yellow for??? (besides the girls' flowers)