Hi,
You will not be able to add colors to the cards or the background, but you can change the color of the background and cards and also enlarge the cards.
a. Click on start and then click on Games.
b. Open Solitaire.
c. Click on Game and then click on Change Appearance.
d. Select your preferred background or deck color.
e. Choose the option "Large Print Deck." This will enlarge the card identifier but not the card. So the cards will be the same size, but the name of the card will be bigger.
Refer:
**http://windows.microsoft.com/en-US/windows7/Solitaire-how-to-play**
Regards,Afzal Taher - Microsoft Support.Visit our **Microsoft Answers Feedback Forum** and let us know what you think.