Heinz - if you have some lovely jersey royals it seems a shame to slather them in mayo. DP did a potato salad a couple of weeks ago based on something he used to eat when he lived in germany, basically boil the potatoes, and whilst they are still warm dress them in a dijon vinaigrette (olive oil, whitre wine vinegar or lemon juice, a good spoonful of Dijon and salt and pepper). It was lovely and made a change from my normal potato salad, hwich is like yours, potatoes, mayo and chives.
I don't like pasta salads at all - to me cold pasta is slimy and horrible, however I think that the couscous recipes here keep far better. I make mine and add chickpeas, diced cucumber, diced red onion and mint, and serve with a mint and yoghurt sauce on the side (natural yoghurt with a spoonful of mint sauce).
I always like serving up slices of peppers (red, yellow and orange ones), along with celery, bread sticks and flat bread, to go with taramasalata, hoummous and tzatiki.