I can't help it. I absolutely Adore these two as a couple. I know they aren't but after Gilgamesh claimed that he wanted to marry her in Fate/Zero, I was done for. The shipping became rock solid.
Saber: What can I say about her? Well, for starters, she's just plain Awesome. She's extremely skilled with a sword, Excalibur, and can also conceal it using mana. Not only that, she died known as the famous King Arthur. Saber us loyal and brave and extremely smart.
And Gilgamesh. He's so arrogant and self absorbed, but I absolutely LOVE him. I don't know what it is, but I absolutely love Gilgamesh. Anyway, he was able to survive pasted the Holy Grail War in Fate/Zero and lived in as a human for ten years before becoming the obnoxiously annoying Shengi's servant. I laughed when he would basically ignore his master or used him for the Grail. Serves him right. Anyway. I don't want to spoil too much for those who haven't watch the Fate series. It's really good. I recommend it. Watch Fate/Zero then Fate/Stay Night [UBW] (it's better than the regular Stay Night in my opinion.)
Here are some photos with other characters from the Fate series.