It isn't always possible to take a photo at the location and angle that you want. But you can straighten the photo afterwards on your Mac using most major image editing tools. Learn how to change the perspective and straighten a photo in Pixelmator, Acorn and Photoshop.
Image glitching can be used to create unusual and random effects to an image. On your Mac, you can convert an image to a TIFF file and then import that data into the Audacity audio editor. You can then manipulate the bits as audio and export it out to create what looks like a corrupt image. This techinque requires a lot of experimentation and trial and error to get a good result.
If you want to use complex graphics or create an animation in Final Cut Pro, you can build your image in Photoshop or another advanced image editing app that supports layers. You can then import that layered document into Final Cut Pro and access the layers. You can apply changes and effects to each layer, or use them to animate portions of the images.
You can set iPhoto and Aperture to use an external app to edit photos instead of merely using the adjustment and filter editing in the apps. You can set iPhoto to use Pixelmator, but Photoshop works more smoothly when trying to save back into your library.