First I watched this tutorial by the SAP:
I followed the steps and really struggled. I tried including various images and none of them worked. Then I noticed this little tidbit in the video:
As this screen shot shows, the image has to be less than 100K in size. The images I was trying it with were larger and as a result they were not working.
To get this to work, I followed the steps in the tutorial. As a test, I added the ASUG Annual Conference logo to a report. In the BI Launchpad, I added the URL of the image to the keyword, under Properties.
So then I launch BI4.4 Mobile on my iPad 1 and success:
My image shows up in the background for the report.