If the pictures were in a folder on a drive/volume that was being monitored by Windows you might look at Restore Previous Version.
Here is an example of how that works:
Windows 7 has a Restore Previous Version feature that you can investigate.
Note that Restore Previous Version (RPV) can only be use on drives/volumes that are being monitored by Windows and sometimes the only volume that is being monitored is the C drive where Windows is usually installed:
In this example RPV would only be available on folders on the C drive or C volume:

If you attempt to use RPV for folders on volumes D or E (which are not being monitored) you would see a message like this:

Right click the folder the files were in before the cut (or permanent delete) and choose Restore Previous Version:

RPV keeps copies of your folders (even personal folders) and accumulates previous versions based on your System Restore and backup activity so there will be a previous version for every Restore Point (if the drive is being monitored) and every backup listed
by date:

In the above example, the one marked Yesterday is when my system made a Restore Point at 1:09 AM and that matches up with the dates in my System Restore calendar.
Then click Restore and respond in the affirmative:

Depending on what RPV has to do and how big the folder is in content, it could take some time since the entire folder will be restored and not just some file(s):

If all goes well you should see this:

Read more about Restore Previous Version here:
http://windows.microsoft.com/en-us/windows/previous-versions-files-faq#1TC=windows-7
If anyone cares to see if it really works use a folder with a few files in it and make sure when you right click a folder that there are Previous Versions listed, then delete a file in that folder and restore it to an earlier date/time.