Rank four big European regions from lightest to darkest in terms of overall pigmentation.

[cyberlorian]

I would say:

1. Nordic influenced region, which is painted blue.
2. Slavic influenced region, which is painted red.
3. Celto-Germanic influenced region, which is painted green.
4. Mediterranean influenced region, which is painted yellow.

Inspired by Bobby Martnen.

[Area51Defender]

I'd put it this way, with six big European regions:
1. North European region (Scandinavia, Baltic States)
2. North-Middle European region (British Isles, Netherlands, Belarus, Russia)
3. Middle European region (Belgium, Luxembourg, Germany, Poland, Former Czechoslovakia)
4. South-Middle European region (France, Switzerland, Austria, Hungary, Romania, Moldova)
5. Italo-Balkan region (Mainland Italy, Former Yugoslavia, Albania, Bulgaria)
6. South European region (Iberia, Sardinia, Sicily, Malta, Greece, Cyprus)