I didn’t know the meaning of the phrase “That’s something.” In fact, I didn’t know the noun meaning of something, while I often use it as pronoun. Yes, something as noun means like important, great, and truth. So I can also say “You’re something,” in the sense of “You’re great.” However, I think it’s a little difficult for me to get used to the phrase, because “You’re something,” sounds like “You’re something great,” for me. Also, I feel a kind of hesitation from “You’re something great,” for complimenting someone.
