Attached is a patch to allow certificates to be generated in Flash if you prefer that to the existing PDF option. The patch will let Moodle call up your Flash certificate and passes student and course data such as student name, etc. The actual Flash swf is not included in this patch - you get to design your own.
For those not familiar with the "patch" format, on Mac, Linux, and other POSIX systems you can use the program "patch" to merge in this functionallity with whatever version of the certificate module you may be using. On Windows, TortoiseMerge can be used.
The maintainer of the certificate module has indicated he may add this to the default download of the certificate module if there is enough interest, so if this is of interest to you please indicate so.