Think of tags as like a book index where you find words and which pages they are on, the same principle applies here. Although it's taken a stage further so it might not be the word, but the subject, so for example if you're looking for things to do with fractal gradients for example. A tag may bring back posts with gradient files, as well as posts that discuss gradients, or tutorials about them.

peggi wolfe3

Peggi Wolfe

This is the site where most of my art is. They have several items you can put your art on, like prints (different types), greeting cards, magnets, coasters, coffee mugs, postcards and mousepads.

Pixels

DeviantArt

Redbubble