Yeah, that list isn't even limited to RPG's really, they tend to reappear in many games. I'd definitely enjoy doing a sunken ship location.
Here's a list of what I have now, and you'll probably recognize a few themes from quite a few of my earlier games:
* Misty forest
* Mushroom forest
* Temple ruins
* Glowy flowery place
* Lava cave
* Generic everyday cave
* [Secret, won't tell]
That is, I've started out creating those areas and got the theme graphics (tilesets, background scenery) partially done.