For workspace:
self runningWorld backgroundImageData: (UniFileStream new open: '/path/to/image.{bmp,jpg}' forWrite: false; useBytes) contentsOfEntireFile. self runningWorld restoreDisplay.For world morph inspector (at backgroundImageData) (will not reload itself):
(UniFileStream new open: '/path/to/image.{bmp,jpg}' forWrite: false; useBytes) contentsOfEntireFile.