It's going to take time for all the apps we know and love to transition to material design, but Koush is off and running with a pair of updates today. His Helium and AllCast apps have been tweaked with more material elements and a few bug fixes.
On the off chance you don't know who this Koush guy is, or why he wants to cast all your things, here's the deal. AllCast is an app that streams content from your phone to devices like the Chromecast, Apple TV, Fire TV, and many more. It has a new action bar UI and more material animations. Helium is a backup and restore app that can be used with or without root access. This app also has more animations and a new action bar, but the colors have also been changed a bit.
There were a few bugs in the initial updates this morning, but everything should be ironed out now. Both apps offer limited functionality free versions if you want to try them out. The pro upgrades are $4.99.