I've been moving away from multi-column layouts recently. Even with Bootstrap the less columns you have the easier things are to adapt to a mobile display.
There's quite a few good (really outstanding) free themes available for Bootstrap (though the page/file size runs pretty high on some of them). I found them pretty easy to adapt for my other project, although I haven't tried it on ICMS yet it shouldn't be too hard.
Good free Bootstrap theme sites include: BlacktTie: http://blacktie.co
Start Bootstrap: https://startbootstrap.com/
Get Bootstrap: http://getbootstrap.com/getting-started/
By the way, I still can't find a way to have line breaks in my posts. If I preview the post (first time) it looks fine, but it ends up with no breaks.<!-- input filtered -->
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