Thank you Jon Brommet for making this short and informative class. I find your technique to create even texture with the High Pass filter and Average Blur filter very helpful.
As for my projects, I used my own artworks to showcase the letterpress effect.
Original artwork from a Skillshare assignment on travel sticker: Icarian Travel Sticker
Original artwork from a Briefbox assignment on typography: Paths of Voyage
Original artwork from a Skillshare assignment on family crest: The Karoli Family Crest
Watercolor paper texture: Doc Adam's Flickr
Jon Brommet (the teacher for this class) suggested on increasing the letterpress effect. I tweaked the layer effects on the 'Artwork' layer to increase the effect.