Introduce a friend to Inklingo or Quilted Diamonds, and let her (or him) choose the book or shape collection she would enjoy the most. 

You can set any amount and add your own message. The certificate itself is a PDF that is 
e-mailed to you. You can print the certificate to enclose in a card, or forward it to your friend in an
e-mail.

If you would like to remain anonymous for a Secret Pal gift, leave the "from" area blank, and let me know, so I can e-mail the certificate directly to your friend.