[fel64]

You do need a localisation file, but if one doesn’t come with the topic it’s typically the sort of thing you can do for yourself.

Some wp themes let you set the colour scheme in the admin panel (Mandigo for one), but it’s a fairly simple task to open the style.css file and change the hex colour-codes (once you understand what they are).

Having bb as a subdirectory of wp is a good start but it’s not necessary as far as I know. My wp install is in a folder /wordpress/, while bb is in the forums subdomain. This should be everything you need to know on integration: https://bbpress.org/documentation/integration-with-wordpress/