Changing Font and rounding top and bottom of posts

We love this theme and have used it for several sites. I was wondering if you could help me understand how we can change the font to a more cursive style font that matches the client’s logo? There are several font options, but they are all very business orientated.

Secondly, if it is possible to round the top and bottom of the posts on the front page, that would also be very helpful for giving it a more boutique feel.

Thanks