Text formatting options

Method 1
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All the blocks in the ticker are separately identifiable.

The outer wrapper is "block-ticketyboo-1" or 2 or 3 etc

Each item in the ticker is "ticketyboo_1_0", "ticketyboo_1_1" etc.

So your site stylesheet could have a CSS rule such as

div.block-ticketyboo-1 div.ticketyboo_1_0 {color: red;}

In this way you could have a different format on each item in the ticker.

Method 2
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The ticker shows the teaser element of the original post. The teaser is normally the first few words of the post but it doesn't have to be.

When editing a node there is an option "Show summary in full view". If this is unchecked the teaser and the main body are completely separate. So you could format the teaser part to suit the news ticker and format the main body for the reader of the full article.

I hope this is some use.