If you're hosting a Father's Day fête, here's a classic but cute napkin fold for your table. This link has complete instructions.
If you're going to do this, spice up the look with mismatched nakins, or set Dad's place with a bold pattern and the rest with coordinating solids. Start with this batik from World Market or bold stripe from Pier One. (mulitple locations nationwide and throughout Chicagoland)