QUOTE(harmony_inlove @ Jun 11 2007, 06:23 PM)

but wait, can we choose our patronus? i mean doesn't it reflect what we feel or where we get our strength from? because can she really make her patronus sound like potter?
First of all, thank you for compliments. I try.

As for choosing your own patronus. I don't remember reading about anyone "choosing" it in the books, i also checked Lexicon too. It says there:
QUOTE
After a severe emotional upheaval, a witch's or wizard's Patronus may change form (HBP16); this happened to Tonks after Sirius' death, when her Patronus seems to have taken the shape of a wolf (HBP8).
Also in HBP:
QUOTE
He [Harry] was, however, reminded of a question he had with regard to Tonks, and who better to ask than Lupin, the man who knew all about Patronuses?
"Tonks's Patronus has changed its form," he told him. "Snape said so anyway. I didn't know that could happen. Why would your Patronus change?"
Lupin took his time chewing his turkey and swallowing before saying slowly, "Sometimes ... a great shock ... an emotional up-heaval ..."
"It looked big, and it had four legs," said Harry, struck by a sudden thought and lowering his voice. "Hey ... it couldn't be — ?"
That means, rather than on choice, a patronus reflects the caster's inner emotional status. Thus far we know these patronuses (again from Lexicon)
QUOTE
Harry's Patronus is a stag (like his father's Animagus form) (PA21, OP1).
Hermione's Patronus is an otter and Cho's is a swan. Seamus wasn't sure what his was, but it was hairy (OP27).
Ron's Patronus is a Jack Russell terrier (JKR)
Dumbledore's Patronus is a phoenix (JKR)
Harry's and DD's obviously connected to their respective caster. We are yet to see Ron's patronus to take shape and both his and Hermione's patronuses get explained. I expect to read more info about them in DH.
As i was perusing HBP for patronuses, i came across this subtle moment though:
QUOTE
Harry looked sideways at Tonks under his cloak. Last year she had been inquisitive (to the point of being a little annoying at times), she had laughed easily, she had made jokes. Now she seemed older and much more serious and purposeful. Was this all the effect of what had happened at the Ministry? He reflected uncomfortably that Hermione would have suggested he say something consoling about Sirius to her, that it hadn't been her fault at all, but he couldn't bring himself to do it. He was far from blaming her for Sirius's death; it was no more her fault than anyone else’s (and much less than his), but he did not like talking about Sirius if he could avoid it.
Just another example of Hermione being the voice of reason for Harry, and once again Harry not listening. Unfortunately, that seems to be the trend in HBP!Harry.
S.