There's a tutorial for creating Logons in the help files of LogonStudio. If you have Photoshop, that and LogonStudio is all you need for logons. For icons again photoshop is what you'll want to use to create them, and save them as PNG files. PNG can be used with many of the programs, such as ObjectDock, DX, HoverDesk, etc.. If you want to go further and create actual icons, the thing to do is convert the PNG's to ICO with an icon editor, such Stardock's IconDeveloper, Axialis IconWorkshop, MicroAngelo, IconSushi, etc.