Ilk is a unique theme that combines the popular and beautiful material design with a different design philosophy that is mainly based on roundness and stitches. It touches never before themed elements such as the recents task view header.
THIS IS A CM12 THEME and YES IT WILL WORK ON CM12S and CM12 BASED ROMS. IT WILL NOT WORK ON OTHER ROMS.
CM12 BASED ROMS ARE NOT FULLY SUPPORTED YET. I AM WORKING ON IT. THERE ARE MANY ROMS OUT THERE.
PA is not supported because it is NOT A CM12 BASED ROM, your SystemUI WILL crash and you MAY have to wipe data to fix.
This is the best and most unique theme around.