When I'm not designing dungeons, I like to toy around with castle plans. Here is a design that is a work in process. It is inspired by Restormel Castle in Cornwall, England. This is the ground level. The upper level will contain the living area but I haven't finished it yet.
Edit: I've adjusted the saturation levels on the grass & ground.
Click on the image for the larger version:
The Legend for the castle is as follows:
2 Gate (with portcullis & reinforced doors)
3 Open Courtyard
3A Starirwell (Down)
3B Stairwell (Up)
6 Storage / Pantry
Now to work on the 2nd level.