Cover a plastic-foam ball with silk flowers and hang it from a looped ribbon so the flower girl can carry it as she walks down the aisle. Or, have a florist create a ball of fresh flowers.
Instead of a basket, have the flower girl carry a wand embellished with fresh or silk flowers, a poof of tulle, and long, trailing ribbons.
Fabric-covered tin buckets make lovely (and sturdy) carrying baskets for a flower girl. Fill with a bouquet if flower petals cannot be dropped. (See instructions in the link below)
Your flower girl will be delighted to carry a special fabric purse filled with rose petals. Be sure to determine if your wedding venue allows dropping the petals; or, just fill the bag with silk petals or a small bouquet. (See instructions in the link below)
Let the flower girl carry a small nosegay that mimics the bride's bouquet.
A ribbon handle added to this bouquet holder would make it an appropriate accessory for a flower girl. Fill the embellished wallpaper cone with rose petals. (See instructions in the link below)