A couple years ago, I did "Frog Week" here on my blog. It was a takeoff of Shark Week, but with less teeth.
One of the posts that week featured 100 poison frog sketches. The plan was to make digital artwork of 100 Poison Frogs. I did four of them and then moved onto something else. The frog sketches sat in a folder until I got the idea to create a big frog out of all those little sketches. This is the final result.