Convert a blender into a dimmer lamp
you can't just swap the motor for the a lamp. because the speed control probably used a multi-wire motor (with a different wire for each speed)

you could fit several lamps and then have the buttons select a lamp. or you could possibly wire the push buttons in as the replacement for the potentometer in a regular triac lamp dimmer







simulate this circuit &ndash; Schematic created using CircuitLab

but the heat from the lamps might be a problem, unless you use dimmable energy efficuient lamps. lit might be easier to go low voltage from the start and install LED lamps.

there's probably room where the motor was to put a LED power supply
and use rund the switched to the brighness input of the power supply.