Creating a color palette with 1000 colors is quite extensive for this format. However, I can generate a curated selection of colors that represent the true autumn color palette. This palette typically includes warm, earthy tones inspired by the fall season. Here’s a smaller selection that embodies the essence of a true autumn color palette:

 <True Autumn Colors>
1. Pumpkin Orange - 
          
          #D65F2E
        - A vibrant, warm orange reminiscent of fall pumpkins.
2. Golden Yellow - 
          
          #D9A44D
        - A rich, golden hue that mimics the changing leaves.
3. Burnt Sienna - 
          
          #8A4B28
        - A deep, earthy brown-orange that reflects the autumn landscape.
4. Olive Green - 
          
          #7C7B4D
        - A muted green that captures the essence of fading summer foliage.
5. Brick Red - 
          
          #A63929
        - A warm, rustic red that symbolizes the warmth of autumn.
6. Mustard Yellow - 
          
          #C8A93A
        - A dark, mustard tone that adds a touch of brightness.
7. Chestnut Brown - 
          
          #7B4B3A
        - A rich brown that evokes the feeling of fallen chestnuts.
8. Rich Burgundy - 
          
          #7B2A35
        - A deep, wine-red that brings a sense of warmth.
9. Deep Teal - 
          
          #2E5B5D
        - A muted teal that pairs beautifully with autumn tones.
10. Harvest Gold - 
          
          #C19A6B
        - A soft, warm gold that represents the harvest season.

This palette captures the warmth and richness of true autumn colors, perfect for designs that aim to evoke a cozy, seasonal feeling.

Would you like to explore more specific color combinations or themes within the autumn palette? Or perhaps a different palette altogether?