I fish mostly Pennsylvania freestone and limestone streams. I carry three boxes: General Patterns, Imitator Patterns and a small box of midge patterns.
These are the patterns that are in my "general" fly box:

Dry Flies:
A.C. Caddis - sizes 14, 16, 18, 20
Elk Hair Caddis (in various colors) - sizes 14, 16, 18, 20
Stimulators (also in various colors) - sizes 12, 14, 16, 18
Hare's Ear Parachute - sizes 14, 16, 18, 20 & 22
Adams - sizes 14, 16, 18, 20, & 22
Royal Wulff - size 14
Cracklebacks (various colors) - sizes 14 & 16
Club Sandwich - sizes 10 & 12
Ants - sizes 16, 18, 20, 22
Rusty Spinner - 14, 16, 18, 20

Nymphs:
Hare's Ear - 14, 16, 18
Pheasant Tails - 14, 16, 18, 20, 22 & 24
Soft Hackle Hare's Ear - 14 & 16
Partridge & Starling Soft Hackle - 18, 20, 22
Various soft hackle wet flies - 14 & 16
Caddis larvae - 14, 16, 18
Prince Nymphs - 14, 16, 18

Streamers:
Woolly Buggers in various colors - 8 & 10
Light Spruce - 8 & 10
Clouser Minnows - 8 & 10

My Imitator box changes in content depending upon which month it is. Currently it contains mostly Sulphurs, Baetis, Cahills & Drakes in their approriate sizes with a fly to imitate each phase of the respective bug's life cycle (nymph, emerger, dun & spinner).

My midge box contains:

Griffith's Gnat - 18, 20, 22, 24 & 26
Black Beauty - 22, 24, 26
RS-2 - 22, 24, 26
WD-40 - 20, 22, 24, 26
A.K.'s Midge - 22, 24, 26
Brassie - 20, 22, 24, 26