InThePicture allows you to embed files and messages into .bmp files. Some features include:
Multiple unique keys that are useful for encrypting data intended for multiple recipients of the same file
A drag-and-drop interface
Can generate its own cover images in BMP format in the event few BMP files are available
Supports 16, 256, and 16 million color BMPs
More information about this program can be found at www.intar.com.