I think many
polyculture gardens include "normal" vegetables. I know mine does! In my kitchen garden I have
apple trees, pomegranate trees, canna, artichoke, French sorrel,
perennial leek, garlic chives, Canada onions, walking onions, various herbs, roses, other perennial flowers, in clumps scattered throughout the garden as well as vegetable bed areas. Also a bird feeder and a little frog
pond.

I plan to add more perennial vegetables but continue to grow most of my annual vegetables in this garden which is convenient to the kitchen. I usually plant my annual vegetables in polycultures within the bed, including several types of vegetables in one patch.
What it looked like last Fall:
Here's an example of a garden with mixed clumps of everything including annual vegetables, all in one garden:
http://www.youtube.com/watch?v=8YHLmByKpts