At the moment Multibit does not have a deterministic wallet so there is no support for paper wallets.
The most similar thing is to create some receiving addresses and then export the private keys to an encrypted backup file. You can then put the encrypted keys on a USB stick.
How To:
http://multibit.org/help_backupWalletUsingPrivateKeys.htmlIt is on my list of TODOs to support hierarchical deterministic wallets, but it will be a while yet.