Hydrangea Icosahedron
For folding Hydrangea Icosahedron (and many other shapes as well), you can just follow the instructions for Hydrangeaa Cube, ...
Tessellation Modulars
Tessellation modulars are a class of models generally similar to modular origami, but with the modules being tessellation-based designs. This is similar, but not quite identical to origami quilts (modular tessellations).
This page lists folding instructions for models of a single type. You might be interested in the models themselves instead.
Hydrangea Cube
The idea of connecting several Hydrangeas occurred independently to me and earlier to Meenakshi Mukerji. If you do not yet kn...