A Non-Standard shape is defined a little differently for each subtype.
For an AW0001 Halo, it means it can now be shaped something other than circular, like a star, or a triangle, but it also means it can have gaps in the circle as well. Altogether the gaps should make up no more than about 30% of the halo.
For a BNNUY02 Windchime this means being allowed to have just a bell, or just a tassle-like item. Keep in mind that multiple bells or multiple tassles will more likely need a higher number trait, or the "Stacked or Connected" trait.