My dream job would not require "selling myself" as I loathe that. I value humility, and my dream job would also. There'd be no game playing and trick questions. Words like "conceptual", "creative", "passionate", "ethical" and "quiet and focused" would be emphasized over "detail-oriented", "outgoing", "team player", and "organized".
Basically, I usually find the entire interview process phony and degrading. My dream job would allow me to show up to the interview dressed in my style of professional (no faux conservative interview look), hand over my resume & portfolio, and be asked only relevant questions related to actual job skills (no BS like "where do you see yourself in 5 years?" questions). I wouldn't be judged on how well I schmooze, but rather the quality of the work in my portfolio, my proven past experience on my resume, and my enthusiasm for the position. They would let me know at the end of the interview if I got the job or not; none of this "we'll call you for a second interview" crap. They'd also be upfront about the pay/benefits/vacation so I don't further waste my time if it's poor compensation.
My "semi-realistic" dream job would be a conceptual graphic design position that may include some hand elements (illustration, hand-lettering, etc) and minimal supervision and client interaction. It would be for a topic that interests me (music, art, fashion) and include a variety of projects (print ads, packaging, multimedia, web). I would have junior designers beneath me to deal with more tedious details, and programmers to handle the dull, technical aspects. It might also include copy writing, marketing concepts, and directing photo shoots. It would be in a spacious, colorful environment in a walkable area of a city and have all the latest equipment. It would allow for me to play loud music while working also. I might be able to telecommute on some days too. (Hey, you said "dream"

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Otherwise, leading some bohemian lifestyle as a writer/artist/musician would be my ideal. Working at my leisure in a loft in a cool city or in some beautiful countryside/sleepy beach town with no supervision, no interaction with idiotic people, and creative fulfillment and satisfaction.