If the ceiling is a color other than white, Bounce flash does not work unless you post process for color correction.
rgrenaderphoto wrote:
Got a Speedlight? Can it support bounce flash? Take a standard white business envelope, rotate the flash head pointing upwards, rubber band the envelope to the head and shoot. The light off the ceiling (unless it's in a commercial space with 30' overhead) will illuminate without the harsh direct flash, while the reflection off the envelope will illuminate the foreground.
The attached is a commercial product, but illustrates.
If your Speedlight has a pop up diffuser, use that.