Be sure to tell your wedding cake decorator about the temperature and humidity conditions of your wedding reception location, i.e. in a tent with potentially high summer temperatures, so they can determine if a stabilizer will be required to ensure that the frosting will not run.
Color and decorations
Select colors that will compliment your wedding color theme. Also, keep in mind that due to varying lighting, temperature and humidity conditions the frosting colors may change after on the cake. For example, purple buttercream frosting may turn blue when exposed to a high level of Ultraviolet light like sunlight. Be sure to talk to your wedding cake decorator about the conditions that may affect the frosting.