My thing is I have never fished dries and I usually just euro nymph and instead of carrying an extra reel with me I planned on carrying a small tankara rod just for dries if the occasion calls for it and I don't want to go crazy with a hundred different patterns I really just want a few patterns that will work in most cases.
Since the OP has only 12 posts and could be relatively new to the sport, it might be worth pointing out to him that many of us are listing generic patterns, good most of the time, rather than specific patterns for specific hatches. Those might be a completely different set of flies.
I am relatively new, I've only been fly fishing seriously for about 3 years. I have only been nymphing and thought that maybe if I broaden my skills I won't miss out on some of the best fishing the state has to offer.
From one euro guy to another.... Get a dry fly rod and reel and go dry fly fishing at places like pens or Big Pine. Dry fly eats are so exhilarating and it is some of the most fun you can have IMO.
It's also worth pointing out that you can use your euro rod to throw dry dropper rigs by just tying your point much longer and using a good dry fly packed with cdc and junk that floats real well. Then you can fish a caddis hatch or whatever top and bottom