As many have said, a gold coloured iPad could easily look silly, but I think Apple is planning on making one, and here's why.
The gold 5S surprised me a little when I first saw it because of how modest the colour is - in fact I think a slightly stronger gold colour on the iPhone would look even better.
I'm now wondering if they made it such a light gold colour so that using a ton of that same colour on the back of an iPad wouldn't look ridiculous.
Would be really interesting to see a mock up of an iPad with the 5S shade of gold...