All designs by SEF (alien polymath)
Be aware that colours vary between different fabrics *and* display devices. Check via test swatch if you need an exact match to something. Go off-site for better indexing into the designs on here.
Description:
Special cases of rectangles, where the square of the ratio of sides is a rational number, so that there are rotational angles where the vertices line up along cartesian axes again. This includes simple squares, A#-papers (ie root 2 based), hexagons (ie root 3 based) and root 5 combinations etc.