The Dieline (http://www.thedieline.com/) is a blog for showcasing cool packaging designs. Not sure that this one has any files per se that you can download & use, however as you’re looking for templates for unique package designs they have 2 free pdfs that gives you designs for all types of random packages (which you could recreate yourself in one of the programs, or simply draw on paper and have the Glowforge cut for you)…
http://www.thedieline.com/blog/2015/10/27/packaging-dielines-2-a-free-resource