Useful alternative control structures?

Question

Sometimes when I am programming, I find that some particular control structure would be very useful to me, but is not directly available in my programming language. I think my

Answer 1

How about

alternate {
    statement 1,
    statement 2,
    [statement 3,...]
}

for cycling through the available statements on each successive pass.

Edit: trivial examples

table_row_color = alternate(RED, GREEN, BLUE);

player_color = alternate(color_list); // cycles through list items

alternate(
    led_on(),
    led_off()
);

Edit 2: In the third example above the syntax is maybe a bit confusing as it looks like a function. In fact, only one statement is evaluated on each pass, not both. A better syntax might be something like

alternate {
    led_on();
}
then {
    led_off();
}

Or something to that effect. However I do like the idea that the result of which ever is called can be used if desired (as in the color examples).