You could copy/paste (OLE) a raster file into AutoCAD (or LT) and resize it using the handles. If you right-click on the image, use 'Send to back' and turn off the 'Selectable' option, you can draw geometry over the picture.
If it's a scan of a legacy drawing, you *could* effectively trace it (providing the scan is of good enough quality!).
Hope this helps,
thefonzzz