my fav design is the water bomb as yu can piss people off with it aka by frowing it at em wif water in it lol

My favorite is the origami rose. The kind I learned is similar to the Kawasaki Rose, but a lot easier to fold. (I tried using online diagrams for the Kawasaki Rose and couldn't manage to figure it out.)

I also like modular origami because the pieces are really simple to fold, but when you put them together, the end result looks really complex.