User submitted ideas with voting.

Love the plugin. So, here's my question. I want to create a site where the public can submit ideas, probably via Gravity Forms, then show excerpts on the front page where people can vote on them. Here's the functionality I'd like to emulate: http://bristolrising.com/browse/?recently=rated

I could use some suggestions on a responsive grid layout theme that would enable displaying of post excerpts beautifully. The logged in users (using BuddyPress) can then vote on either 1) the excerpts or 2) by clicking "read more" and then voting on the full blog page.