WooThemes makes great themes and one I like is Saving Grace. I am in the process of customizing a theme for a church that is doing a campaign to raise funds for a building. I suggested Saving Grace to them because of how perfect it is for their situation and for any church or charity where giving is a huge focus of the site. The theme includes donation functionality through PayPal.
Saving Grace Theme for Churches, Charities, Donations, Campaigns and More from WooThemes
About Nick Blevins: I'm the husband of a great wife and the Children and Student's Team Leader at Community Christian Church in Baltimore, MD (White Marsh). I'm all about serving churches to help them reach their full potential. nickblevins.com :: twitter.com/nickblevins