I built a little extension to Micro.blog that lets you easily add a photo grid to your website. Thanks to @manton for making Micro.blog extensible! – https://github.com/cleverdevil/microgram
@dancohen good question ... I assumed using that css extension that @cleverdevil included on git - and setting image size to (say) 100 - which I have done - would work - but nothing :-(