I guess I kind of have two masterpiece projects in my head. One is my series of stained glass window wall hangings based off the windows from the game Legend of Zelda: The Wind Waker----currently working on the color schemes. The other one is a quilt made of t-shirts of my favorite band, Kittie----unfortunatly I have to go collecting shirts again because the shirts I had are/were at my ex's place (among other things) and he refuses to give them back (Ah well...some of the shirts are off the band's website so it will just mean more money for a struggling band. Can't argue with that).
I don't really consider a "masterpiece" a display of skill. For me a masterpiece would be something I worked really hard on and am really proud of.