I actually think that Dean's patronus in this is the Impala. As in the ACTUAL car Impala rather than a shiny magic version of it. Because Dean's about the making magic, not the wand magic, and in some ways the Impala is what he created to protect himself and his loved ones against what he fears.
I think Sam's patronus might be something even weirder. And maybe something that SEEMS innocuous, but in its magic shiny form is bright and amazing. (Hermione has an otter, doesn't she - which is still powerful, even though an ACTUAL otter isn't that terrifying - it's the force of her magic that makes it powerful). So by this logic, Sam's patronus could be a cute puppy, and still whack the hell out of things. I don't think it is a puppy though. Maybe Sam's is a unicorn (which would be poetic in the sense that the unicorn saves him at the end, also that the unicorn loves Dean).
Or (just to jazz things up) if a patronus is generated by memory of happy things - then maybe Sam's patronus would be a shining image of DEAN. Mmm I don't think it works like that, but I like the idea.
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I think Sam's patronus might be something even weirder. And maybe something that SEEMS innocuous, but in its magic shiny form is bright and amazing. (Hermione has an otter, doesn't she - which is still powerful, even though an ACTUAL otter isn't that terrifying - it's the force of her magic that makes it powerful). So by this logic, Sam's patronus could be a cute puppy, and still whack the hell out of things. I don't think it is a puppy though. Maybe Sam's is a unicorn (which would be poetic in the sense that the unicorn saves him at the end, also that the unicorn loves Dean).
Or (just to jazz things up) if a patronus is generated by memory of happy things - then maybe Sam's patronus would be a shining image of DEAN. Mmm I don't think it works like that, but I like the idea.