I agree with river rat.
I get away with only a few patterns or designs and after that its just size and colour.
My seven are:-
1) Klink ( i have done without this so far this year)
2) CDC and Elk
3) Bread and butter (a CDC comapradun)
4) A Parachute fly like the Adams
5) Cul de Cannard (an F fly on a curved buzzer style hook)
6) An emerger parachute (just a wee klink really without all that fuss at the thorax)
7) A another emerger with the CDC wing mid body (i did a sbs called LDO emerger)This pretty much has caught all my fish this year
I dont really bother with nymphs for trout anymore but if i had to i would use a PTN (both weighted and unweighted).
Thats eight