I made these sigs for my lil bro Crystys using Byakuya Kuchiki, one of the captains of the Gotei 13 in the popular manga/anime Bleach.
I experimented with using a transparent background and I kind of liked how it turned out:
Unfortunately, Crystys told me that this sig isn't allowed in the forum he's going to use it for because the height is over 150 pixels. So I made another one without the transparent background but instead used some effects to make it look like animated sakura leaves. This is because Byakuya's shikai (sword release) is called Senbonzakura, which makes his sword dissolve into tiny pieces like sakura leaves. Beautiful, but really deadly: