We are often asked if the countertop of the island needs to match the existing kitchen countertop in style, or what will be installed as the main kitchen countertop. In most homes I would say it does match, but it really does not have to at all, nor does the material need to be the same. In fact, if you are not going to match them up exactly it's better if it looks like you are not even trying to match them, so using a completely different color and surface is perfectly acceptable.
For those remodeling and looking for an "open" feel where perhaps the wall or half wall separating the kitchen and the dining room is taken down, a strategically placed island acts as a subtle room divider mentally separating the kitchen from the dining room but with a much more open feel.
Mind Your Head : If you are hanging anything from the ceiling, make sure that there is sufficient clearance so that people do not bang their heads on a skillet or frying pan! Clearance is all-important with kitchen islands, because there is not a lot worse than having a kitchen that is severely restricted in space just to accommodate an island. The island should complement your kitchen, not dominate it.
Kitchen islands are mainly of the wooden or the stainless steel types. They can be used in the kitchen or they can be of the outdoor type where they can be placed in the backyard or next to the swimming pool for preparation of outdoor meals. Kitchen isles can be made of blocks where each block has a particular function or they can be one big unit that incorporates all the requirements into the structure. One can build simple wooden kitchen islands that have drop leaves to save space.