There have been quite a few PlayBook apps that have allowed you to add effects to your pictures over the past year. The latest to join the club is Pixelator from Siversink Development that promises to spice up your pictures. It offers effects, filters, and more for your pictures along with the ability to add borders.
Check out Pixelator for $0.99 in App World. I am hoping they add a free trial in the near future.