Well there’s corn on the cob, and red onions, and celery, and bell peppers.
assitant
Cabbage, cauliflower, zucchini, eggplant, and so on.  Also, make sure to season it well, or it can be bland.  And it could also use a marinade or other liquid, to break up the chunkiness.  Is there anything else I can help with?
assistant
what are some vegetables to put in a potato salad?
user
Potatoes and tomatoes are common.  Here are some examples:

Potatoes:

Regular potatoes
Sweet potatoes
German Butterball
Fingerling

Tomatoes:

Large, vine-ripened (I like the flavour of sun-ripened ones, too)
Heirloom
Salad (just chopped and mixed in)

Other ideas:

Green onions (chopped)
Sour cream (can also add after cooking, if desired)

Other vegetables:

Onions
Cucumbers
assistant
Interesting. What else could I add, vegetables wise?
user