I HAVE DONE THESE FOR YEARS W/MY GRANDBABIES! The munchkins can't make a mistake any color combination works and we have done our theme colors many years as well. I Just had to be mindful of age because of the glass. They even look great in a bowl or glass jar or vase or basket with some tinsel for decoration!
I made these with my sons kindergarten class last year and let them using a sharpie write their name on it then I put the year on. Then they took them home for their parents to remember years from now how their penmanship looked in 2012 to the current time