Believe it or not, one of my first ever real cakes I made (like, for someone else!) was a wedding cake! I can't figure out who was crazier, the girl who asked me knowing I had never done that before or ME for saying yes!
I still cringe when I see that cake because I see every little thing wrong with it. (Side note: the couple who this was for is no longer married...hmm...)
But I do like the flowers on the cake. Flowers are just pretty for any occasion, but can especially bring a charm and elegance to a cake. The problem is that you don't want to just stick flowers directly into a cake. It's not sanitary or healthy.
To get around that, I use flower spikes. I bought mine from my local Michael's, so I'm sure any craft store that carries cake decorating supplies would have them. If not, you can order them online.