To Create a Selectable Variation:

1.  Create Product “Colour Choice”
2.  Select as Variable
3.  Create the Attributes
4.  Set the prices (required)
5.  Modify the CSS -

.single_variation {
display: none !important;
}

.single_variation_wrap.bundled_item_wrap {
display: none !important;
}

6.  Add the product “Colour Choice” to the composition