1. the file explorer is due o your tsk theme... the one the changes the bar color, just find an all black theme. If you have it try the htc default theme. For touchflo 3d colors look here for touchfocus colors
http://forum.xda-developers.com/show...13&postcount=1 and here is grey
http://forum.xda-developers.com/showthread.php?t=430527
2. youtube cannot be removed since it is an application. to remove alltel, remove it from your opera favorites (thats what appears there)