To me, few things say "classic TV" as effectively as test patterns. I'm assuming most of you are somewhat familiar with classic American patterns, so here are a few interesting sites with images of vintage test patterns (or "test cards" as they are known in the UK) in other countries.
WORLDWIDE:
http://www.oodletuz.fsnet.co.uk/tcd/world.htm (recreated patterns, but meticulously so)
http://www.meldrum.co.uk/mhp/testcard/around_world.html
CONTINENTAL EUROPE:
http://www.oodletuz.fsnet.co.uk/tcd/europe.htm
http://www.geocities.com/TelevisionCity/Lot/2941/testcard/europe.html (also Africa and the Middle East)
UNITED KINGDOM:
http://www.oodletuz.fsnet.co.uk/tcd/ukcards.htm
http://www.meldrum.co.uk/mhp/testcard/bbc_test.html
http://www.meldrum.co.uk/mhp/testcard/ita_test.html
WORLDWIDE:
http://www.oodletuz.fsnet.co.uk/tcd/world.htm (recreated patterns, but meticulously so)
http://www.meldrum.co.uk/mhp/testcard/around_world.html
CONTINENTAL EUROPE:
http://www.oodletuz.fsnet.co.uk/tcd/europe.htm
http://www.geocities.com/TelevisionCity/Lot/2941/testcard/europe.html (also Africa and the Middle East)
UNITED KINGDOM:
http://www.oodletuz.fsnet.co.uk/tcd/ukcards.htm
http://www.meldrum.co.uk/mhp/testcard/bbc_test.html
http://www.meldrum.co.uk/mhp/testcard/ita_test.html