Flyfishwithme's Micro Nymphs inspired me to post these for your perusal. His micro size talent is beyond my abilities right now but very enticing.
These are #16 & #18, I think, (old photo) That is as small as I go with the Caddis Pupas.
These were not tied for photographing, I was playing with a new P&S camera, but they are representitive of my flybox, and the trout like them.

Emerging Caddis Pupa ... with homemade "wiggle-dub"



Emerging Caddis Pupa ... from Hans W's Flytier's Page (Can't remember which tier to credit)