i have brown eyes also and the good news for us is that any pigment color can work
did you want to branch out from neutrals and purples? if so i would recommend getting into greens next, maybe teal or golden olive? either one would be awesome. and if you want to stick with color families you are used to, i would recommend violet for a purple and maybe tan for a more neutral choice. melon is beautiful also. ok, i will have to stop here before i end up listing all of the pigments as suggestions!!
what they said, plus coco, and if you're willing to branch out a little, try green brown or blue brown. if you're willing to branch out a lot, i also use fuschia, teal, and blue.
Neutrals (and close): Tan, melon, chocolate brown, blue brown, deckchair
Other colors that look great: teal, golden olive, burnt burgundy, maroon (DC and HTF), rose, deep purple, emerald green