Try this link. It works great!

How to customize logon background/screen in windows 7 « Windows 7 Home

Here's one that works like a charm. I don't remember where I got it but just Google for it. You can use any picture for your boot screen/logon. W7C LogonUI Changer 1.0.1.0 and the best part is it's FREE.......
Found a link W7C LogonUI Change 1.0.1.0 - Windows Live

Hi

Thank you for the tip, however I did post a workaround (which is a bit complicated and invoves a registry change) which works very well and does not involve any additional programs or services.

Jeremy

Here is another in-spite of nice Freeware customization tool tweaks.com. Check this one out.
Customize Windows 7 Logon Screen

Thanks again for the follow up. My understanding is that the next RC update will have a built-in mechanism to update this screen. Let's wait and see.

Jeremy

Originally Posted by maddmaxx

I really don't have a logon screen since I am the admin. I don't mind the boot screen at all but the underwater screen while it's starting is boring. I would like to have the ability to change it to something that I like. Again a minor thing but when you look at it for six months or so, yuck

I use the tuneutilities2009 in vista to change all my screensavers from the boot screen to the logon screen. They have some real awesome ones. unfortunately, tuneup2009 isn't compatible with windows 7. If you find a way to change them let me know. I am anxious.

Hey Hambone,
Didn't you see the two links posted above one by me and one by anand1? Same software just different download sites. I use this and it works perfectly. Please dude read the previous posts in the thread,

This works well but is a bit tricky to implement

Jeremy

I also I believe that MS will be implementing an automated approach to changing the logon screen with the final release.

How to customize logon background/screen in windows 7
May 7th, 2009
If you don’t like the default logon background of windows 7,or you want to change the background to a picture you like,you can do it easily in windows 7 without any third-party softwares.Below will give you a simple guide about how to do it.
1.First launch regedit then go to HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\Curr entVersion\Authentication\LogonUI\Background

2.Change the vaulue of OEMBackground to 1,which indicate to enale logon background customization in windows 7

Tip:If you can not find this entry in your registry,please try to create one.
3.Go to %windir%\system32\oobe\ ,create folder info then create another folder backgrounds under info,then copy your own background picture here and rename it to backgrounddefault

Note:The size of this picture must be less than 256k ,or it will not work.
4.Done,you can see your new logon background after logoff.It’s so easy,isn’t it!