I never seem to want to use a stand-alone digital camera anymore. Oh, maybe I would if I had a super groovy SLR, but point-and-shoot? Nah, I'll just stick with my iPhone--especially for blog photos.
Recently, I've been taking an original photo with the built-in camera and manipulating it with one or more apps. Oh, sure, I could do all this and more with PhotoShop, but with these apps, it can all be done on my phone, completely intuitively and in a relative few minutes. I'm not lazy so much as I'm impatient. OK, I'm lazy, too.
These are my favorite apps, currently:
Photogene: I use this for basic cropping, rotating, color adjustment, etc., before importing the images into other apps that don't have those functions.
As you see, I can start with a pretty awful image--one I would never post as is. But, then...
TiltShiftGen: As you might guess, this app was created to generate "Tilt-Shift" images. However, I've been experimenting with the selective focus to accentuate a particular object or texture. The app is nice in that gives you a choice of either a circular and linear progressive blur that can be positioned at any point and/or in any direction on the image. It allows one, also, to adjust the amount of vignetting and basic brightness, contrast, and saturation.

PictureShow: There are a lot of ways to manipulate a photo with this app's variety of frames and filters, most of which don't suit me, but I really like the few that do. All the components can be used interchangeably and then, beyond that, the app imitates a number of types of photography such as "Instant", "HolgaGraphy", and my favorite (although I haven't used it here) "Cinema", which mimics the look of litho photos you see in old magazines or posters. This app also allows you to adjust the red/green/blue separately, but it's a little clumsy (as is the brightness/contrast) and the vignette function is useless. Best to do that stuff in Photogene before bringing the image up in PictureShow.
Another app I love is Hipstamatic, which works more like a regular camera--you choose your "lens", "flash", and "film"--then shoot away. It's always a bit of a surprise what you'll get.
Finally, I like "ShakeItPhoto" for achieving a fairly nice Polaroid effect.
Granted, color accuracy can suffer with some of these apps, so they aren't always appropriate; but when color is an issue, there's always at least one app that will work.
The best part of all this is the CONVENIENCE, which I love.love.love. I can take my photos, manipulate them, and post all from my phone (although, I usually still compose long posts on the computer).
It's funny, I seem to be moving in two separate directions. I have a Holga, an SX-70, and a Yashica mat 124g that I've been experimenting on the lomo end (which may be the subject of a future post) and at the digital end, I have my iPhone photography. I suppose the unifying principles are the often dreamy, not-quite-real quality of the resulting images and my willful ignorance (and laziness) about the technical side of photography and/or software.
So, there you go. If you try any of these at my behest, have fun and let me know how they work out for you!