Hi there!
Here are 16 free patterns on transparent background.
I have included Ai (CS3) with all patterns in swatch panel and PAT file with all patterns for Photoshop (CS5), as well JPG and PNG for each pattern.
They are free for personal and commercial use , just do not sell patterns themselves.
You can use it for greeting cards, creativity and just for fun. 
 
Enjoy it!

                                       DOWNLOAD IT FOR FREE
                                            
                                               Please Appreciate the Project!