I have 2 things up in Cydia as of now that are for iPhone4 only one is called Carbon Fiber Folder Icon, the othier one is called IP4 Carbon Lockscreen. I will have 3 more packages up soon including my full theme, (unfortuneatly I am selling the theme, way to much time and work with iOS4) Blue Carbon Fiber IP4 Theme Complete with lockscreen, folder icon, and tons more. Please Look for it and I will update it weekely with new icons etc