So I just watched this video from JayzTwoCents about this interesting and tiny SFF Case, The LOUQE Ghost S1.
I love SFF cases like this (well I love looking at them, haven't actually built one myself but maybe one day)
This one seems to be pretty good, You can check out their product page and Kickstarter for more information on it, it's also modular.
Here are some videos of a build time lapse in the case:
Air cooled
Liquid cooled (CPU)