If you use a picture content control, you can add whatever size picture (e.g. 'a big red rectangle') you want to that and have a Document_ContentControlOnEntry macro run whatever process you want as soon as the picture is clicked on. MacroButton fields containing pictures don't execute their macros when clicked on in Word 2007 & later.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]