Here's a few simple dry/nymph suggestions and size; patterns:
Sept-Nov: midges (24; black beauty see TPO recipe), blue-winged olives (20-24; WD-40, RS2, pheasant tails) and isonychia (12-14, 2XL; gray Wulff, comparaduns)
Dec-Mar: golden stones (8-12; see TPO recipe), sucker spawn (see TPO), egg patterns (lots of variety here), scuds (14-18; trout crack)
I think these represent a typical cross-section of useful patterns, although the list is not meant to be exhaustive. Streamers are always worthwhile, at certain times.