There was an applet that displayed a colour Apple menu icon on black and white Macs. It was an optical illusion but quite effective.
There were also some SCSI video adapters that drove external colour monitors. They were pallete based devices that used system software add-ons (probably INITs) to hook into QuickDraw. When an application drew one of the common QuickDraw patterns, it was mapped to a colour block on the external monitor. The number of applications that they supported were limited and the software was very sensitive to system version. The market was people using Macs for business presentations. Similar SCSI projector and slide writers were produced. Check the small ads in the back of Mac User during the late 1980s.
There were also some SCSI video adapters that drove external colour monitors. They were pallete based devices that used system software add-ons (probably INITs) to hook into QuickDraw. When an application drew one of the common QuickDraw patterns, it was mapped to a colour block on the external monitor. The number of applications that they supported were limited and the software was very sensitive to system version. The market was people using Macs for business presentations. Similar SCSI projector and slide writers were produced. Check the small ads in the back of Mac User during the late 1980s.