Are the 50% of color tags only on clothing? Or are they on other things such as housewares?

The 50% color tag discount is available for housewares and other merchandise in addition to clothes. Just look for the sticker on the item with the color of the week across the top border.

I know they have a color special every day

On Wed it is half off clothes and linen and sometimes they'll add something like shoes and purses as well