The bride's shoes don't always matter because depending on the length of the dress, no one may ever see the bride's shoes. One of the keys to picking shoes is to remember that no matter how fun a wedding day is, it is long and the bride needs to be comfortable. Always try the shoes with the dress, the person making alterations needs to see how it will sit and be worn the day of the wedding and he/she may advise the bride what shoes would go best with her body type and the dress type.
The same thing applied with Mother-of-the-Bride/Groom shoes and Bride's maid shoes. Their shoes may be seem more, depending again on the dress length. Shoes can match the colour scheme or just simply match the colour of the dresses, however the Bride's maids shoes should be similar, if not the same, and definitely the same colour.
Shoes will not be what everyone is looking at so feel free to wear flip-flops. Some can look very elegant and for most younger woman they are very comfortable.