I did a quick check and got this: I too prefer the Xp-style of graphics on the playing cards.
You can copy your XP versions of Sol.exe, Freecell.exe etc. to your Win7 machine
and you will also need 'cards.dll' from your XP Windows folder.
The cards.dll needs to be in the same folder as the games exe files.
Here's the full link: http://goo.gl/2C88R