How should I go about creating Pixel Art?

I know I'm late to the post, but I just started Unity and trying to figure out how to properly import my pixel art work. Such as taking my 32x32 grass tiles and making a 3D ground in Unity to be covered with those grass tiles. Searched many a forums and vids to find what I'm looking for...probably something simple, just overlooking it. Any help would be appreciated.

Anyway, GIMP is a great tool for pixel art creation. I enjoy doing hand drawn work, but feel a little more sense of pride doing everything click by click of the mouse. Takes a lot longer, but you get faster the more you do it.