A little bird told me, that people like black shirts more than white ones... Therefore, I created some black Planet-PHP shirts and some other base colors. Sadly the shop does not offer the exact color we use and shirts in so-called flock-print are a bit more expensive. Nevertheless, here are some of them:
Black shirt
A blue variant
You can find some more variants in my shirt-shop.
Sorry, that the shop is only available in German. If someone knows an international shirt-shop offering flock-print, please inform me!