All the icons in this theme have a white border to make visibility easy but "cross" and "crosshair". "cross" and "crosshair" don't have a white border and when they become active in some applications with dark background I can't barely see them. If I move the mouse quick my eyes looses them.
Forgot to mention that this also happens in breeze-snow-cursor the other way around; no black border in "cross" and "crosshair" as in the rest of the images.
Sadly this is a bug in DRI, I've already filed a report (I've neglected my own upstream bug report, but I'll get back on it). What's happening is the light border it does have is being rendered much darker than it should be. If you don't mind, please hit up the report in this link and add your own system info: https://bugs.freedesktop.org/show_bug.cgi?id=100534