XF 1.5 Customization questions

Hi! A few questions we'd love help with for our site

How and where can we add a little icon next to a groups username, like seen here?

How and where can we replace these user group bars in the post bit with an image? How do we add one for each group?

How can we add user group name formatting to other places, such as the forum index and discussions list?

Is there a way to condense these any?

Thanks for your time!
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