dried cranberries (other dried fruit)
crushed ramen noodles
If you do a mayo type dressing a bit of sugar/sugar substitute will sweeten it and soften the bitterness of the slaw. If you do a mayo type dressing I would imagine grapes cut in half would be good.
There are also Asian style dressings for broccoli salad - this is a basic recipe.
If there are things in there you don't like i.e., sunflower seeds, just don't add them. It is a good recipe otherwise.
Here are lots of recipes
where you can pull the ingredients out that you like and then determine if you want a mayo or oil/sweet/Asian type dressing.