This might seem like a silly question, but how do you make off white icing? The only thing I could think of was to add a tiny amount of yellow food coloring, but wanted to check and see if I was missing something obvious.
I use Wilton Ivory it works great for a soft off white color
ditto. if you don't have time to get ivory, try a tiny bit of yellow & brown
You can use real vanilla extract (not the clear stuff) to get an off-white shade.
Wilton's ivory was a little to orange for me, so I used daffodil yellow mixed with a very little ivory and it turned out great.
I also use "the cheap brown stuff" (vanilla) instead of clear vanilla when I want an off white color.