We did the Mickey's Birthday Wish for my 4 yo's bday in March. I have to say, even though it is expensive, Disney Florist did a great job. I didn't want the package just like it is and had them switch some stuff around for me. They adjust the price accordingly. For instance, we didn't need another giant stuffed Mickey Mouse, so they let me sub a Capt Jack Mickey that I would've bought him anyway. Since we were arriving by car and were just traveling a short distance (we're just 3.5 hours away), they even let me deliver it the night we got there. We actually were going down to dinner and while perusing the pin kiosk, I noticed the delivery headed up to our room! They were right on time and very prompt.
I liked them so much, I'm going to order something else on our next trip! Probably the Star Wars balloon bouquet for Star Wars Weekend!
If you think Disney Florist is too much, try Memories by Betsy. Or else you could have We Go Shop or the Personal Disney Shopper put something together for you, or at the very least bring you things to decorate with in case you are flying and can't cart everything with you.
Also, if you like the banners and stuff from the Florist, some of the Disigners under
Creative Disigns have recreated them. Worth a look! Although, I just checked and the lady that had all the Grand Welcome stuff is having trouble with her file sharing site. Hopefully it'll get fixed soon.