Is something like DRY a design pattern, a methodology, or something in between? They do not have specific implementations that could neccessarily be demonstrated(even if you can easily demonstrate a case NOT using something like KISS... see The Daily WTF for a plethora of examples), nor do they fully explain a development process like a methodology generally would. Where does that leave these types of "rule of thumb"'s?
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According to Wikipedia it is a principle of software development.
In fact, Wikipedia refers to all of them as principles:
DRY:
In software engineering, Don't Repeat Yourself (DRY) or Duplication is Evil (DIE) is a principle of software development
KISS:
KISS is an acronym for the design principle "Keep it simple, Stupid!".
The principles when applied together intends to make it more likely that a programmer will create a system that is easy to maintain and extend over time
Jay Sullivan
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JD Isaacks
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I'd say that they're basic engineering principles.
A methodology can have n principles.
And they're definitely not design patterns :)
Demian Brecht
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These are the guidelines for your everyday work, crossing the boundaries of layers, problem domains and technologies.
They also form what you would call a philosophy defining your professional practice.