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Not every website out there is made with some kind of generator. Some are made totally from scratch, like this one, for example. To do some of that, you need to know HTML (Hypertext Markup Language). To get started on this, I've listed some of the most common codes out there and demonstrated what they do. To test these, you can paste them into a blog entry or a profile of some sort. Certain websites may restrict you from using some of these codes (like Iconator), so if they don't work it may just be the site.
More help on this subject (other websites):
Lissa Explains It All
Color Codes
Web source
Webmonkey
Categories of HTML:
Text-related
Image-realted
The ever-famed Iconator Code