There is a new version of Polymorph on SqueakSource (Polymorph-Widgets-gvc.103) that supports a background morph for the world that resizes with the main window. I guess the backgroundSketch/Form stuff can be removed (I reused the backgroundMorph inst var - no direct way of setting did remain, accessors now). This can be used for background images (as requested): E.g. World backgroundMorph: ((UITheme builder newAlphaImage: (ImageReadWriter formFromFileNamed: 'Watery 2.jpg') help: nil) autoSize: false; layout: #scaled; lock) (AlphaImageMorph supports a few layout positions/tiling/scaling, more could be added like aspect-maintaining scaling etc.) Or could be helpful for deployed applications... set the background morph to your main UI morph, for instance. Regards, Gary