In April 2009 I showed these ones that I made for a challenge (the original post is here).
And this one is a gate fold one:
and the back shows the semi-circular cut outs:
And here's another version of the first idea:
The components for these came from a kit - strange this challenge came up today because I came across some bits like this the other day and thought I should do something with them, so perhaps I will now I've been reminded of these.
