You can't add tables nor online pictures to 'Plain text' messages but hopefully the 'Styled Text' format supports all that. Actually the 'Styled Text' format is converted into HTML when sending your message. As a result any HTML code added to the message itself will be integrated to the final HTML message as is. That gives a lot of power to that format. For example, the possibility to add online pictures, linked online pictures, tables with text and/or pictures…etc…
Indeed you can embed online pictures into Styled text with the following html code:
Example: (just paste the code below to your 'Styled Text' message)
or in case you want also a link to a page:
<a href="URL_HERE"><img src="PICTURE_URL_HERE" border="0"></a>
or use a table to set a background image to your text:
<table border="0" background="YOUR_PICTURE_URL_HERE"> <tr><td>YOUR_TEXT_HERE YOUR_TEXT_HERE YOUR_TEXT_HERE</td></tr> </table>
You can create any kind of table manually or with a table generator and paste the code to your message. This is handy to format text into columns. There are dozens of table creators in the web just search 'Table Creator' with Google.
Example: (Table with two rows, two columns and no border)
<table border="0" style="background-color:#FFFFFF" width="100%" cellpadding="3" cellspacing="3"><tr> <td>Table Cell</td><td>Table Cell</td></tr><tr><td>Table Cell</td><td>Table Cell</td></tr></table>
You can even add highlighted text into Styled text with the following code:
<SPAN style="BACKGROUND-COLOR: #ffff00">Text to highlight</SPAN>
Like for example:
This is some <SPAN style="BACKGROUND-COLOR: #ffff00">highlighted text</SPAN> to show you how it can be done.
That will show: "This is some highlighted text to show you how it can be done".