Just paint white
painting the ceiling tiles is a great way to update the look. They also have decorative tiles you could use instead of the acoustic tiles, but I'm sure that would be pricey. You could always use wallpaper on the tiles also... https://www.pinterest.com/pin/113153009357237543/?lp=true
Remove the tiles. No matter what you do to them, they will always look dated.
Here's what we did:
You can always paint them but remember the frames are withwr tin, aluminum or plastic and you will have to address them. There are also great decorative tiles available online.