Either if these two can be used as a generic warm up and stretch out.
Gym Warm Up
Kickboxing/Martial Arts Warm up
These are stretching and can be used either side of your workout..but after some walking is good enough to bring your heart rate down.
Wind Down Or Wind Up
Wicked Warm Up Stretching
Touch Yo Toes
Here's a cooldown stretch that I created yesterday! Full Body Stretch
For warmup do some cardio just to get your heart rate up and start breaking a sweat or feeling warm.