I have forked the bitaddress.org site to brand their paper wallets with BitcoinsInVegas.com branding. The reason is to give local service industry personnel and merchants a way to get back in touch with us if you tip them.
To access the branded paper wallets, Click here.
There is a space to write in an expiration date. If you plan on doing this, print out the wallet sheets in duplicate and retain one so you can import and spend it back to yourself after a month or so. Please make sure you let the recipient know you will do this if it goes unclaimed after the expiry.
If you would like your own branding, I can show you how I did it at a future meeting.
Also, please print out some new fliers and hand them out to merchants when you have the chance.