Radiant is offering an add-on to the core Blog module called BlogDisplay. It lets you build a customized blog view that can replace or augment the one that comes with the core module.
BlogDisplay lets you define a display template so that you can build highly visual views of your main blog page. Additionally, BlogDisplay prevents breaking the auto-generated summary in the middle of the word (or HTML code!) by breaking the summary at the end of a complete sentence.
BlogDisplay works with the core blog module starting at version 3.3.1 and up.
BlogDisplay is free and is offered under GPLv3.
Download it from Radiant here.