It's a cute and fun hanging!
I see a darker blue that goes with both your church and snowflake backgrounds. I'd also do an inset flange ..... so dark blue, then narrow flange and then dark blue again. Bind in the dark blue.
For the flange ... I think a white will really make those snowflakes pop and somewhat join them into an overall snowy effect.
BTW .... I was looking for snowflake fabric yesterday, and wish I could have found what you have. By chance, could you let me know the selvage info? Please? and Thanks!