The Swiss? Nice ski resorts and yummy chocolate ;)
Some interesting facts... or legends... According to Wikipedia the Swedish flag comes from a vision by a Swedish king in the 12 century during the first Swedish Crusade to Finland in the year AD 1157. Wow! I didn't even know Sweden had been on Crusades in Finland! :) Anyhow the king saw the yellow cross in the blue sky and held it as a sign from god to make this his banner... History is indeed fascinating and it's amazing how little one knows even about once own country.
Other historians believe the flag is the result of a rebellion against the Danish during the 13th century... The Danish flag is Red with a white cross. Believe it or not but our sweet Danish neighbors have have been at war with us more often than we have been at peace with them for the past 500 years :)
Here are some more flags with crosses :)
http://www.flagdetective.com/df-cross.htm