There is a way but I can not remeber it. Some mod has this in.
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Navigate to Scratch-Blocks>CommandBlockMorph>private>addLabel, then add
commandSpec = 'wait %n secs' ifTrue: [self color: Color blue].
at the bottom. To customize, replace the "wait %n secs" with the display name (not the message) of the block you want to change color, and replace "blue" with either the color name or hexadecimal code of the color you want to change the block to.
Hope that helps - I did this for Zing, but I'm on my iPod Touch at the moment, so I might have gotten something wrong. If I did, just post here again!
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