ThemesKingdom - Invo v1.9 - Blog WordPress Theme | 1,90 MB
This is perfect theme for running freelance business. Simple communication with client from client area, client invoicing and 2 payment gateways (PayPal and 2Checkout) are functions that makes Invo theme ROCKS!
DEMO:
http://www.themeskingdom.com/wordpress-themes/invo-portfolio-client-invoicing-system-wordpress-theme/