I understand how to make my own thumbnails. No problem there.
What I'd like to do, though, is display them at a larger size. Currently they're displaying a lot smaller than even the Fresco demo (currently displaying at 69 x 39 even though I'm viewing in a large window on Chrome/Mac OS X).
I did not see any options in the docs for adjusting the size of thumbnail images. What is the recommended approach for this? Is there a method for this that I am overlooking?