When I try to launch the itchio launcher, I get an error. Fortunately, the GOG Galaxy launcher is able to run 90% of these games, and even has some pretty art tiles for browsing your itchio games. The rest show up as blank tiles, so I started making some really basic art tiles for these games! Here's the growing collection:

https://imgur.com/gallery/1Vubqrb

Update: Added 'nother tile. Unfortunately imgur does not allow album editing anymore, so this is posted at a new URL. I'll probably switch to a better host for future tiles.
https://imgur.com/gallery/3zvKSQA

Update 2: box.com is the way to go! Even more tiles!

https://app.box.com/s/bq7a3vwgpnogxy0e4ojzaduce8hooeq5