KM palettes are amazing and I am using them more and more as time passes.
One thing I love about them is that you get to see what each letter you will type after the palette shows up does.
Certain macro actions however require some input so I specify it in curly brackets. Usually this input is what is in my clipboard. So here for example is an app specific palette for MacDown app which I use to write GitHub README's:
You can see that centered image - {image src}
action requires {image src} to be in my clipboard before activating the macro. Here is how that macro looks :
I think passing required args to the action in curly braces is pretty neat. I wonder if I am alone in using this trick.