Fun fact: One of my favorite D&D supplement books is "Bastards & Bloodlines: A Guidebook To Half-Breeds"
so why do i bring this up? well on my walk to work i was thinking about Rush's Orcs and their interaction with the other races, then my mind began to wander towards on how two different race's offspring looks likes only did the Orc+Dark-Elf because those where what originally gave me the idea (Also i recently watched the Shoddycast's Skyrim storyteller latest episode which dealt with half-breeds(so much like the half-breeds in elder scroll the offspring appearance is heavily influenced by the mother's race however there noticeable differences)

Dark Elf + [color=007236]Orc[/color]
Believe it or not it's not to uncommon for an Orc to take interest in a Dark-elf (Or vice versa) Thanks to Orc Culture heavily revolving around Strength, Hunting and just all around killing same goes for the culture of Dark-Elves which holds the same ideals in high regard but for different reasons (For the Dark-Elves it "Survival Of The Tribe" but for the orc "Its The Strong Who Win")

(Orc Dark elf offspring's are usually refereed to as Grey-Orcs)
As it makes quite the difference in which race is the mother i will be giving quick descriptions of both combinations 
Dark Elf Father + Orc Mother
-Grey skin
-Larger Teeth 
-[color=8dc73f]Bright Green Eyes[/color]
-Faster growth of hair
-Taller
Dark Elf Mother + Orc Father
-[color=a2d39c]Greenish Grey skin[/color]
-Larger Teeth 
-Much more muscular