Oh man I love me some citron!  I think that this color is so great for spring and summer because its so fresh and citrusy.  Citron is a color that can be worn as a neutral and with many colors!  If you want to stay simple, put citron with either black or white for a nice electric pop of color, yet if you want to get madly colorful, you can try colors like purple, pink, gold, green and blue!