I have tried DMGDrop and it is a good product. However, DMG Designs is excellent, excellent, excellent for both creating a background image for the opened mounted volume as well as for imprinting an image onto the mounted volume itself. Did I mention that DMG Designs is intuitive and is exceedingly easy to understand at the outset, although its Help menu is also well presented? There is one thing which DMGDrop does slightly better than DMG Designs and that is to create the .icns file from any other given .jpg, .png, etc. image without having to go to IconComposer. But this is a slight matter as it does everything else excellently, excellently, excellently. By the way, all of this effort at creating a Mac application is intended to be a companion to the web site, Relativity Calculator, www.relativitycalculator.com. Best regards to all the folks at DMG Designs, Don Saar, drdonzi@crocker.com.