The first "trick" I teach dogs is shake paw. Twist and turn are quite easy. And roll over, too(just make sure you do this on a soft floor, most dogs don't like to roll on concrete or wood. Carpet, grass or sand will do)
Sit up(beg, sit pretty) isn't as easy for larger dogs, but with patience it is good for their balance skills. It took me a few months to get mine to offer a well balanced sit up with a few seconds of duration.
Take a bow is nice, most dogs can do it, although it somtimes isn't easy to teach.