On May 15, 2014, at 2:11 PM, Esteban A. Maringolo <emaringolo@gmail.com> wrote:

I think Luc's version is better, but doesn't fit with the new flat look of Pharo.
Also, both icons have a MacOS Aqua look, outdated by today's fashion.

The advantage of using PayPal's standard icon (albeit outdated), is that it is easily identifiable and associated with a donation. It's not just a button, but also an icon.

So I'd keep PayPal's version, unless replaced by an embedded donate form. :)

Regards,

ps: Do people ever donate? 

Esteban A. Maringolo

+1

if you are not sure do A/B testing and get data-backed validation

If you won�t for whatever reason the safest thing is stick with what the world understands the easiest (you don�t want to raise the donation barrier)