Apple doesn't give you a whole lot of photo filters to choose from in the Camera application for iOS 7. If you want to add more, check out the new free jailbreak tweak called Effects+
by iOS developer PoomSmart.
Effects+ will add 20 new filters to your iOS 7 Camera application, including 12 core image filters and 8 Photo Booth filters. Those include:
- Replace (Monochrome)
- Pixel (Pixellate)
- Invert (X-Ray)