Hi! :)
I have already started designing references for some of my other watercolour palettes, but also I'm getting excited to make one for markers, and for a pencil set too! 
Palette references are addictive to make, and are always a great way to get you more in tune with your materials, not to mention the expanded usefulness of references for perspective, composition, and more! 
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I even just had the idea to leave a panel blank to use as a mini dry erase board! EEEeeee! I'm excited! 
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Here are some stills from the class that show my project: