Mac OSX i7 Logon Theme, is bit different from default Windows 7 logon. But a deviantart user has created Mac OSX i7 Logon Theme for Windows 7 which is very similar to Mac OSX i7 original Logon. If you are a Windows 7 user then you can enjoy Mac OSX i7 logon on Windows 7. Below is the preview of the Mac OSX i7 logon:

You can download Mac OSX i7 logon for Windows 7 from the following link:

Download Mac OSX i7 logon theme

If you want to transform your Windows 7 into Mac OSX i7 then you might want to read: Transform Windows 7 into Mac OSX i7 without using Customization Pack.