Thanks, that's really helpful! If you are willing to share the actual ppt template, that would be awesomeThanks. I'm the king of low-tech... I use MS Powerpoint for the text and alignment.
The layout is pretty basic, a number of boxes for the texts and the image, and then some white lines to delimit them: my labels are 9.4cm x 9cm, so I can get 12 labels on a sheet of A3. Once I've got a visual I just need to size it to 7.4cm x 7cm... then I pull the dominant colour for the label from the picture as the fill colour for all the boxes. Feel free to steal the layout from me.
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