I usually just wear a pir of diamond studs. Plain, simple, go with anything... plus, I'm still in recovery from the monstrosities I has dangling from my ears in the early 90s and I always feel weird with anything too big.
I have lots of earrings, so my everyday pair ranges.
For consevative, I'll wear big pearl studs, small pearl studs, diamond studs, or gold Tiffany knots.
I also have lots of colorful chandelier and linear styles, my beloved cz pave hoops, smaller unique pairs, and bolder metal pairs. I probably have about 120 pairs because I pick them up everywhere.
I don't actually have "everyday" earrings. I love earrings more than all other jewelry (though rings are a close second) and I make my own jewelry, so I have lots of choices, and I try to use them all. The only time I'm not wearing some sort of dangly earring is if I have on a fancy necklace that would compete, and then I wear diamond studs.
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"Good taste shouldn't have to cost anything extra." - Mickey Drexler
I have 3 holes in my left ear and 2 in my right and I always wear tiny (tiny as in about 1/16" diameter) silver studs in all the holes, everyday. I never change them; just take them out once in awhile to clean them.
Diamond studs or pearl studs. I get lazy about earrings and when I have either of these in I usually leave them in a for a few weeks, thru showers, sleeping, etc.
i mostly wear a small-ish pair of yellow-gold hoops with channel-set small diamonds. they are understated but shiny. i am a yellow-gold person, so these go with just about everything. i will change to pearl studs, silver elsa perreti hearts or plain diamond studs occasionally, but most of the time i am in too much of a hurry in the morning to do it.
3 swarovski crystal briolettes hanging on silver. they're slightly dangly but are enough fun to wear all day at work and out at night. i stole the from my mom and i always get compliments on them....
otherwise, silver hoops with diamonds in channel setting on inside and outside.
I wear a antique diamond studs..they aren't solitaires, kinda hard to explain..but in any case..I wear these about 80% of the time, the other 20% I switch between some sterling silver drop earrings I love.