Have you tried hexflash?

It's honestly really silly, perhaps a little bit stupid, and insanely fun. I implore anyone who hasn't tried it yet to give it a shot. I can't say it's better than the other options in terms of practicality, but I can definitely claim it's more fun / enjoyable to use, since you get to screw around with it.

There's some really practical applications, like sneaking around and being a stealthy ninja, help you avoid ward detection by going around, cut off someones escape path etc, to the not so practical ones (though still useful and fun) like using it as a support and flashing out of the bush to land your CC, randomly flashing over walls just because you can, and burning actual flash while you're trying to be sneaky because you forgot that it existed and comes back up eventually.