making a cake from scratch, only have olive oil, crisco, butter, margarine, apple sauce - no veg oil. what's my best recourse?

Olive oil adds a really deep, dense, fruity flavor. If that sounds good use the olive oil.

I've used applesauce in chocolate cake with great results.

I'd highly recommend Midge's Grown up birthday cake: http://www.food52.com/recipes/6857_grownup_birthday_cake
The recipe calls for olive oil and white wine, and turns out a fantastic moist and flavorful chocolate cake.

I'm making a chocolate cake, so that works! Thanks!

What type of cake are you making? If it's something that would work will with olive oil, I'd go for that. Chocolate cake or plain cakes made with olive oil have a great fruity dimension.