Is it inappropriate to wear a veil for my wedding vow renewal ceremony?

I don't see what harm it could do. My mother got married by the courts when she was pregnant with me and then after i was born had her "real" wedding. A simple ceremony with friends and family. As for involving the children, have them be flower girls just like a normal wedding. Talk to your pastor or who ever is performing the renewal of vows and tell them what you were thinking of doing and see what they suggest.