Edit photos after the fact
Fake it ‘til you make it. Apps like Photoshop Touch, Snapseed, and Darkroom are all great for touching up your pics after the fact, allowing you to correct color imbalances, straighten, etc.
Use the volume buttons as shutter buttons
One of the many downfalls of a screen-based shutter is stability, and it's further tested every time you jostle your phone to get the perfect shot. Use the volume controls on the side to snap your shots instead, and keep a tighter grip.
Test out HDR mode
Admittedly this can sometimes leave you with an image in Willy Wonka hues, but turning on High Dynamic Range will combine three different exposures into one image for situations with less-than-optimal lighting.