My favorite option is a cabinet door that opens to reveal a sliding shelf where you store a small appliance. The shelf slides out and lifts up to countertop height so you can use it, then you push it back down and slide it back into the cabinet. You need a good sized kitchen to have enough space to do this, but it's wonderful. I don't have it myself, but I've seen it in other houses and always thought it was a great idea.
Like this? Heavy-Duty Mixer Lift | Rockler Woodworking and Hardware
A very petite friend redid her kitchen and put in a lift like this for her mixer...and it is hidden behind a base cabinet door. She had an electrical outlet installed on the wall within the cabinet recess. Easy peasy.
omni