jmbjr

This is the banner template file
SVG banner factory-> https://github.com/crawl/dcss_tourney/blob/master/image-templates/bannerfactory.svg

Open it in Inkscape
Create new text
convert text object to path
Select path text and the wavy line in the middle on the left and run the extension to make the text path have the ribbon effect. 
There are instructions on the far right. I use a horizontal offset of 70 which corresponds with the center of the banner

The exported image will auto-size to anything visible so hide everything except the shadows and banner you want, along with the ribbonified text