This is actually impossible. Bitcoin has two security points, the miners (proof of work) and the nodes (clients such as the reference client).
Gaining 51% can allow you to double spend your own transactions, but you can't spend other peoples money or make more coin, because the clients will reject those transactions even if 100% of the miners put it through. The nodes verify what the miners do. Even 100% control does not give you God power. The best you can really do is deny all transactions and thus destroy Bitcoin.
Gaining 51% can allow you to double spend your own transactions, but you can't spend other peoples money or make more coin, because the clients will reject those transactions even if 100% of the miners put it through. The nodes verify what the miners do. Even 100% control does not give you God power. The best you can really do is deny all transactions and thus destroy Bitcoin.