What's the best thing to take a black and white photo of ?
Anything really. You just have to look at angles and shadows.
The first that popped in my head : A panda.
Anything, it is not the subject, but your skill. Try taking different shots of your subject.
land scape, flowers, dramatic non-smiling ppl, water, or dramatic weather... basically anything dramatic
People and Flowers
A tree with a ton of branches