This app offers filters that mimic old film emulsions of the past, as well as offering fish eye views and infrared simulation.
Here's the complete list:
Helga - A square-format toy camera with washed-out highlights and old-school vignetting.
1974 - This is your father's camera. Faded, tinted, and hip.
Magazine - Emulates effects used in fashion magazines
Lolo - Shoot from the hip and take life as it comes with vibrant, colorful shots.
Cinema - Dramatic, moody, wide-screen stills from the movie of your life.
1962 - Dynamic black and whites from the photojournalists of a bygone era.
Mono - Smooth gradation from black to white.
Infrared - Simulation of the popular landscape photography technique.
Fisheye - Popular fish eye lens effect - try it in combination with other filters.
Instant-emulates the old Polaroid look
Original - The unaltered image.
Some of the filters are subtle. Some are pretty dramatic. I didn't find any of them to be horrible. The app gets good reviews from users, except due to some legal issues from Polaroid, the borders of the images were changed and don't really look like the old Polaroid prints, so users are unhappy with the new filter. The developer is working that out, and is referring users to the US$0.99 version of the app, CameraBag Lite retro, [App Store] which still has the older filter.
The app was stable in my use, and allows you to email the finished images, or save them to your camera roll. The developer is also working on a desktop version of the app for both the Mac and PC. There are lots of apps offered that do similar effects. Ultimately, you need to choose the one that best fits your needs. I think the CameraBag filters do a nice job, and are easy to use. They are certainly worth a look.
Here are filters I applied on a landscape photo, along with the original for comparison: