Yesterday's guess the dungeon partial map was taken from the sample dungeon on page 95 of the AD&D DM's Guide.
Here's another partial map from a classic dungeon:
And here's another original dungeon geomorph:
The PoGI Kickstarter has had a good day today and has just made it to the first stretch goal. That unlocks a free graphic design pen for the majority of backers (nearly all the pledges are at the 8 pad level that the stretch goal applies to).