Some nice stuff there dawg! Maybe you can use more different fonts, not always those graffiti and scriptina fonts.
maybe download some brushes too.
You rather stay with sigs and improve them, then you can try to do some wallpapers. IMO sigs are way easier to make than wallpapers.
I got some nice looking banners, but once a month I try to make a wallpaper and it looks awful every time
/edit: borders!
