In Splapp's Drawing Masterclasses, he's been composing professional, astounding how-to videos on drawing animals: they make Van Gogh, Picasso, Da Vinci, etc's masterpieces look like child's play. Nothing compares to his drawings. As a side note, there's been an interview with Doge on his opinions of his drawings. Anyway, from class #005, the cover used under the iconic drawing envelope has changed in design and color from #001-004 to #005, as shown in the pictures below:

Coincidence I think not