Codes list:
- Bold text;
- Italic text;
- Underlined text; 
- Strikethrough text;
- Center text;
- Text on the right;
- Text on the left;
- Changing color;
- Changing size;
- Changing color AND size;
- Making a link;
- Text with a background;
- Border around your text;
- Putting a image in your description;
- Scrolling Marquee.

Click HERE to see them all.
Tumblr was changing some codes so I decided to put them on a separate page.