Put your logo on each page in the same place. Use the same text color from page to page. If you have those billowing begonias on your index page, use a begonia flower for all your navigation buttons. Whatever you choose as navigation buttons, use the same ones on each page. If you use a text graphic for navigation, repeat that from page to page.
Repetition is comfortable.
It holds the site together. Of course, the same thing all the time could be boring to the viewer. Back to the nursery business. Perhaps all the bulbs pages would have a green background, while all the herbs pages could have a blue background, and the annuals a yellow background. But they might all have the same basic layout otherwise.