These families are located in the Casework and Specialty Equipment folders (categories) of the REVIT Library.
If you want a variation of one of these families just click on it, then click Edit Type on the Properties Palette. Then Duplicate it and name it. Then change some of the Type Parameters and Bob's your Uncle !.
The counter top families have grips and you can stretch them around but only in a Plan view.
Do some investigation by checking out the different Type Parameters on each individual Family.