Get a can of flat black paint, a cheap 1$ inch and a half wide brush type paint brush (not foam) and a block of wood. An old 2x4x12 ripped in half for a 2x2x12 works great.

Be sure you're in a place like outdoors where splattering paint won't matter and wear old clothes and eye protection.

Dip the first 1/4" or so of the brush tips into paint and wipe some of the excess from the brush onto the rim of the can so its not drippy.

Smack the wood of the brush just above the bristles against the wood block above the cabinet you're painting. I highly suggest making your first tests on some old newspaper to get used to where the bulk of the droplets are going so you can aim better, and find what level of paint is required in the brush to get the density and coverage you desire.

I ruined a decent pair of pants the first time I did this and ended up tossing them in the trash before the wife'ee had a chance to see them.

I did this project as described above. Spots on a cabinet hides many, many sins. This head was full of dings so I put a lot of spots of all sizes:

Spots.jpg