Colors in lomography are saturated, dreamlike, and often unpredictable. That's the beauty of them! That said, you can usually count on certain cameras to give certain "looks".
Lomo LC-A or Diana cameras produce the signature "lomo" look, with intense teals and yellows.
Holga cameras, on the other hand, have built in "ColorFlash", giving the option to change the color of the flash unit.