Quick Userstyle I'm using for the I/O 2013 Google Plus interface. I personally found the multicolumn layout to be utterly useless on the desktop, and the single column was too narrow, so I widened it. Caveats: Images are still set to the width of the default stream, and hence would appear centered in widened posts. There's a commented out declar…

googleplus_2013_singlecolumn_1000px.css

@-moz-document url-prefix("https://plus.google.com"), domain("plus.google.com") {

    /* Post Channel*/
    .Dla.Ebb.nqa {
        width: 1000px !important;
    }
    
    .noa.Kv.Tc.Nl {
        width: 100% !important
    }
    
    /* Post Images*/
    /* Enable to stretch any image to fit width (1000-15) even if it means looking crappy. */
    /*.ev.MAvK1e.lg7oNe {
        max-height: none;
        max-width: none;
        height: auto;
        width: 985px;
    }*/
    
    /* Gallery Posts */
    .dT6Wrb {
        margin-left: 25%;
    }

}

Of course, I can't get the proper inset image size with userstyle alone. Will write userscript later.

Unfortunately, if the images don't come in a high enough resolution, simply changing the url parameters will result in crappy looking images. A compromise would be to try to fit the width but center the image if smaller than the width.

Got the userscript to work. I'll make a script only version with configurable style later.