Where is a good source for me to learn how to make these?
SeriousCake's YouTube page. She can make just about anything out of buttercream.
I gotta say I love her video soundtracks!!!!
Stoopid internets double posting my messages!
the whimsical bakehouse has a video tutorial about making a hydrangea cake covered in hydrangea blossoms (complete with chocolate leaves):
they also cover making hydrangeas in their "little cakes" book.
using two tones of buttercream makes the best looking hydrangeas
Thank you all! These are very helpful!