There are some examples on the Freeplane website:
You can download it and try it, or draw them on paper.
There’s also a related discussion here: Mind map software-generated
You can even draw them directly in the forum by using Graphviz format like this:
graph {
{node [style=filled, color=yellow] Sun}
{node [style=filled, color=blue, fontcolor=white] Mercury, Venus, Earth, Mars}
{node [style=filled, color=lightblue] Moon, Phobos, Deimos}
Sun -- Mercury;
Sun -- Venus;
Sun -- Earth;
Sun -- Mars;
Earth -- Moon;
Mars -- Phobos;
Mars -- Deimos;
}
I don’t use mind maps often, but some people like them. I prefer to keep my notes in lists, and I’ll draw diagrams, but they aren’t exactly mind maps. I sometimes use things like color and arrows, but more like this:
