Blonde highlights for gray hair - here's a good idea to camouflage gray hair with blonde/gray-ish highlights. Upkeep would be easier if the highlights are more "grey" than blonde so not as noticeable when roots grow out.
The Hashtags That Went Viral in 2015: 2015 Celebrity Beauty Trends - Gray hair trend: #GrannyHair -- Women of all ages (including three Allure editors) color their hair gray after Zosia Mamet, Rihanna, and Amandla Stenberg. | allure.com
85 Silver Hair Color Ideas and Tips for Dyeing, Maintaining Your Grey Hair