may be every * should switch to stego so atleast nsa and other agents wont detect encrypted traffic.

better if u encrypt it-then put it in .gif .jpg .wav .bmp .mp*

the chances that they will be traced is far less.

if use bmp-the resolution of the pic may come down a little.

if u use jpg,wave let transforms such as jpeg 2000 instead of all dct jpgs and then putting in pixels,it would be easier.
as far as i can say hiding in mp* and jpg is the best.

hide seek is a good tool,there r many others like that.
use them-stay safe.
good luck