Consult the ancient tome of Deep Dreaming for forbidden knowledge on manipulating the subconscious.
Or, if you're feeling particularly adventurous, try your hand at Simulator for a chance to summon digital specters and reanimate the dead... of your computer.
For a more... shall we say, 'hands-on' approach, visit our Neural Surgery page for instructions on how to perform delicate and intricate surgeries on your neural networks.