As almost all European players I feel I lack in points of my reading ability. Therefore I do a lot of tsumego. I very much like the collections of Cho U, if you ask me he is a genius when it comes to tsumego. Especially his ability to create new tsumego out of nowhere is impressive.
Today John and I tried to do the same and I must say it was really a lot of fun and I still can't stop thinking of new problems.
Even though it is not easy to create something totally new. Here are some of my clumsy attempts. As for Johns I can't post them here without asking him first. Maybe we will see his Go-problems later.
Black to play.

This will probably go down in history as the first
not completely trivial tsumego I ever created.

Even though it is rather simple there might be some kyu players having trouble with this one.

This is in my opinion the most difficult problem I created so far. White to do his best to kill the black group.
(Note: Unfortunately it turned out that there is a simple way to solve it, so don't be afraid ;) )
As I already said it was great fun to model some own tsumego and I think it can help you a lot, because you have to think about the shapes you use very carefully.
If you find some mistakes or you just want to check your solution you are welcome to leave a comment, I will happyly reply to it.