potato salad is still a good option, but you will want to use primal ingredients. instead of pasta salad, you could make coleslaw, or actual salad. even before going primal, if i saw a big bowl filled with all kinds of colors and fresh veggies sprinkled with a little olive and vinegar or lemony dressing, i would have gone after the veggies.
plus, cucumber salad is a great option, and a beet and carrot salad. and, or course, more meat.