[support] How to theme front page teasers

[Albert Cuesta]

Hi

My site has two main content types, each with their own taxonomy  
tree. I would like to display teasers from both types in the main  
content area of the front page, interspersed according to the posting  
date. However, I would like to give readers a clear indication of  
which type each teaser comes from. I was thinking of adding a  
coloured bar running down the left side of each teaser for all its  
height, with the colour depending on the type and maybe the type name  
appearing vertically inside the colored bar.

As an alternative, I could use different background colours for  
teasers of each type.

Can somebody help me in doing any of the above? I'm not a CSS type  
and I don't know how teaser theming works.

Thanks in advance for any assistance
--
Albert