This WordPress plugin will manage your 16px ads on your WordPress site. It even has a upload form to let your clients upload their own ads. The code for the plugin was originally done by Menguzar but i have taken up development since he has dropped the project.
Please visit http://vasthtml.com/js/wordpress-adicon-plugin/ for usage instructions.
For a DEMO visit www.vasthtml.com and scrol down to the footer. Feel free to upload any icon you have for free!
Be sure to backup your adicon ?images? folder before you update.