7 surprising A/B tests for fundraisers. 

2) Which banner got most clicks?
This test was performed before the launch of a petition for milieudefensie.nl. In the original version, a slightly different font-type was used (according to their housestyle-guide).  
FUNDRAISING LOVE
Buiksloterdijk 342, 1034ZG
Amsterdam, The Netherlands
Tel. +31 6 5179 5739 (weekdays)
SOCIAL:
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LEGAL:

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FUN FACT:
Ewald's lastname is Verhoog, which actually means 'to INCREASE' in English