TikZ shapes are extremely hard to create – even the documentation admits as much.
On the other hand, the selection of shapes that ships with the
tikz package is pretty meagre – besides rectangles, circles, diamonds and regular polygons there isn’t much more. A split circle and a few strike outs is about all.
Is there an online repository of ready usable high-quality shapes?
For example, I’m searching for a tag shape and while this is of course straightforward to create myself1 it’s still a lot of work and most probably redundant since someone else must have needed the same shape aready.
1 I’ve already created a “document” shape with a dog ear in one corner based on the tutorial in the documentation. Including debugging and parameter tweaking, this has certainly taken me more than one hour.
I do not know of a central repository, however, there are a lot of examples at TeXample