The meaning of "it" depends on context, but normally it would refer to the expenditure of time, money or effort. "I like to do things that I can show for my time" isn't quite right. You could say "I like to do things that give me something to show for my time".
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AnonymousHi,Can the it be plural?I have nothing to show for them.Thank youIt is possible if you are referring to a plural thing. For example, "All those years, and nothing to show for them".