I´m very glad you are happy with the brushes!
Those brushes has not the usual aproach and could be not so easy to learn how to use them. Actually, I never saw other brushes with alpha and negative. Brushes use to be only positive.
Off course I wanna see wath you have done. If you want you can send to my email :caiojosechagas@gmail.com
You can, also, start some gallery here, in Deviant Art submiting your pieces.
Cheers!