I think it sounds like a really viable plan, but like the others have mentioned - you really need some input from your current customers.

If I was a customer, I'm sure I'd love the option of grabbing a cup of coffee while I viewed the artwork. Having a few different options - like tea or hot chocolate as well - would probably work better than only providing coffee.

I'll be curious to see how this goes for you. :)
Take care,
Christina

The Happy Slob's Guide to Housecleaning
http://www.happyslob.com
P.S. Be sure to join my free weekly house cleaning newsletter - it's more fun than you'd expect...