Looking For Periwinkle Flowers For Dress

My daughters quince is in a month (April 04). I`m putting the last minute touches here and there. One problem is that my daughter did not go with the traditional pink dress. She decided she wanted it white because her birthday is in April. It`s a nice dress but would like to break up the wedding dress look. I`ve had the hardest time looking for small periwinkle flowers to add. Anyone that has any idea where I can get some sm periwinkle flowers to add to the dress? Your response would be most appreciated!!!

Thanks,
Jeannette from Houston, TX