well i needed for my last project an updated version of theme cards, so I have decided to port it to uikit 3. You can check the theme out directly from marketplace:
It comes with some nice modifications to easy customize the different card styled for widgets as sites. Blog card style can be changed too, for similar experience as the original template you need to disable the panel style for the blog page, set it to none, and pick your style you wish for the blog panel style.
A demo is available also here:
Any comments as suggestions are welcome, as bug reports of course.