look at scale hvac hoof vents for ho buildings and the like?
I have doll oil lamps and shades that look like low profile mushroom vents, and bigger that are perfect onion stacks.
A trip down the toy isle, slowing at the trucks and spaçe toys may be productive (dollar store). Same with craft stores wood /plastic knick knack and dollhouse details... It's shape you want; not a lamp or table.
Shaving down marker caps and bodies. There are metal boarder plumbing screens, similar to a garden or wash.machine hose screen or faucet screens.
A plumbing supply/hvac house might have a cone "no-hole washer" you could work with. (check valve parts)
small plumbing pipe caps walls cut off?
Caps for small bottles and sprays are often knurled if that appeals.
