I wrote on them using Foodwriter markers - easy!
The fondant is easy to tint with food color - I used plain white and pink for the hearts and colored some yellow for the lyres.
Last year, I made Greek letter cookies and had trouble with them being fragile so I switched doughs for this year (from White Velvet Cutouts to Cut Butter Cookies) and then I couldn't find the letter cutters. I know the fondant icing will work great on them - next year? or next Panhellenic event? Hearts were great for this event since it's almost Valentine's Day.