As always, I bring in my example of my [3.5, obviously] warforged DFA who had absolutely nothing to do with dragons and who was instead a direct ripoff of Inspector Gadget. (Go Go Gadget Hot Glue!) All of his abilities were Go Go Gadget something-or-other. He also got all of his items made as attached or embedded components, so he had all kinds of things popping into and out of his body with a simple GGG declaration.
In D&D 4e, I play my Runepriest as a Truenamer (or, if you catch me on a punny day, a Rune Aimer), but that's not so much "refluffing" as "finishing what WotC started."
Then there was my [3.5 again] Spirit Shaman. He was a dwarf from Boatmurdered and, rather than a traditional
imaginary friend spirit guide, he thought that the spirit of an elephant was stalking him. The spirit of the elephant WAS stalking him, actually, but it wasn't an elephant. It was the ghost of his dead husband, who
Chrysanthemum Vow'd himself while off fighting the Elephant Wars. (What? Like YOU'VE never combined Dwarf Fortress lore, Edo-period literature, and D&D into an unholy abomination before!) Rather than actually meditating with his spirit guide, he just drank until he couldn't see the elephant anymore (a process I called "communing with the spirits." Commence groans).