While on the Mexico Trip, I was introduced to a new iPhone and Android app called Paper Camera and it's pretty fun (iTunes). It costs $0.99 ($1.99 on Android) and the above picture is a screen shot of what it looks like. It gives you 12 filters to make pictures and videos more interesting. In addition to taking pictures, you can also upload existing ones and apply the filters after the fact. It's very similar to Instagram (iTunes), which if you've ever used it, is also pretty fun.
Unfortunately, there's no easy way to share with friends within the app yet, but it's pretty easy to upload normally once the picture is taken.
What I do is take a picture normally. Then upload it to Paper Camera to add a filer. Save that to my Photos app. Then I upload that to Instagram, annotate it, and share with Facebook/Twitter/Foursquare. Gosh, that sounds complicated written out... It's not that bad.
What are all the filters? I took the same random photos of my HP mug with all the different filters. Check them out below. If you have a dollar to burn, and enjoy messing with your photos, this app is worth getting.