We have got the similar problem. We too tried the General field as picture but it doesn't stretch, is there a way to make it stretch.
We have also made our own custom report using Visual C++, but it needs alot of work to make it generalized.
We tried it in crystal reports 6.0 but without any success.
In case you come across some easier solution please let us know at kalraashish@hotmail.com.

thanx,
-rajiv