Were you thinking the "Out with the old, in with the new" logo from the front page? I kinda like like the 7thgencivic.com logo that's up in the upper left corner of all of the pages too.
Maybe something for the top of the front quarter over the wheel well, or the lower rear quarter?
I'm unaware of how much it would be to have the magnets printed... Another idea would be to have them printed on self-adhesive vinyl and then just stuck onto bulk magnetic sheet and cut out. That route might be significantly cheaper.
