I made this cake years ago, but I've always liked it because of the sugared roses. Sugaring roses or other flowers gives them a crystalline appearance and helps preserve them so the color doesn't change as quickly. You can do them ahead of time then use them when you need them...You'll need to experiment to see how long various types of flowers will last, though, since they all behave differently.
Here's the video:
Always remember to put a barrier between the flower and the cake if there are pesticides on the flowers, and never insert stems directly into a cake!
Kara Buntin owns A Cake To Remember LLC, online cake supplies at www.acaketoremember.com and www.acaketoremember.etsy.com