I like wincustomize, but the sort seems really poor for discovery. It's either last updated, the newest stuff, most popular, stuff that causes the virtuous cycle for those, the vicious cycle for the rest, and recently featured which is nice, but doesn't help less popular themes get discovered. Therefore I think there should be a random option for sort with the seed decided when the person clicks the button as to avoid repeats. That would make discovering underrated, more obscure themes so much easier. There are plenty of hidden gems out there.