We can change infolinks ad colors and underline format.Definitely this will help you to increase your infolinks income.Change the infolinks ad color which is 
suitable for your website so that it will help to blend the ads with text.And we can also change double underline to single dotted underline format.
Also Change the content category which is suitable your blog content.If you want to modify above things just go to infolinks and sign in it will go to your account.Look for integration guide tab in that particular page find Advanced Integration Wizard to customize your settings link go to that link there you can modify.
You can also increase your infolinks income using related tags.
Above integration guide page itself you can find related tags page.Just to that page and add html tag into your website.