there are several different styles to sigs. sprite sigs aren't just labled sprite; they have different styles like every other sig. one example can be found on google->images, type in sprite sig tutorial and look for the akuma sprite. it's on the first page. you can go to various sites, almost every site i've been on has an interesting sprite sig, or at least an interesting concept. i've made
if you're interested i could make a tutorial for this, if you wait a couple days, but it's not like there's a shortage on sprite tutorials~