those mask things

hi, just a quick question. i have psp8, & i have no idea what those mask things or for. there's a couple of different ones too. if anyone has time, i would like to know what those are for; hahaha. & how to use them. rather than not knowing forever, i'd like to know now so i can use it & not let it go to waste. i could be making really awesome icons right now if only i knew how to use them! =]

thanx in advance!

xx