Apple iTunes also has Photo Editor Pluggins by Aviary App for iPhones, iPads for Free.
1. Download the app (iTunes) or (Google Play)
2. Open app and choose a photo to edit.
3. Click Effects
4. Scroll left and open the "Shop" (you may have to login to your Adobe profile to see this. If you don't have an account, you can register here"
5. Download each of the Effects
6. Repeat for Frames, Stickers, and Overlays.
Editor's Notes & Price Research
Please refer to the forum thread for any additional details. -persian_mafia
Update the app from the app store to version 3.5.0.
Click shop on the top right and sign up with Adobe. All the Effects, Frames, Stickers, overlays and bundles are free. You can restore these with the email even if the app gets deleted later.
New Aviary update states that this offer has been extended thru the end of this year.
App update notes:
With a free Adobe ID, you can now:
-Unlock Aviary’s complete collection of photo editing supplies – a $200 value free for a limited time and yours to keep forever!
-Sync your downloaded supplies (including free packs!) and restore anytime
Update: Works for Android too. Added the link. Thanks BoldIntrepid.