Place with all the colors of the wool
Wool Slabs, as the name implies, are slab versions of their wool block counterparts. A fun use could be as a very thick carpet, or as carpeted stairs.
Crafting[]
Wool Slabs are created like any other slab, by putting three wool blocks of one color in a row in the crafting grid. However, if you use more than one color, then White Wool Slabs will be crafted.
Usage[]
Wool Slabs can be crafted back into wool blocks by putting two in a crafting grid. Once again, the color rule still applies. This can be used to un-dye wool, if you need to.