Double Babies

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My cousin and his girlfriend are having twins. They are not planning on finding out the sex of the babies until they are born.
So I want to make them blankets. But I want the blankets to be similar, but different.
I was thinking of maybe doing something in bright colors....like crocheting squares and then hooking them together.
I was thinking of maybe doing the squares in different colors and stitches...like single, double, shell....etc.
I'm not very advanced yet, so what I make has to be pretty simple.
Has anyone ever made anything like that before?

I want to make them something too because I am poor..heh heh
And I need neutral colors.
Does anyone have a good pattern they can share for something cute I can do?
I mean if this seems like it will be too much work, I wont do it and I can make a more simple blanket.
I just want them to be different. I don't want to start the twins off from the get-go with everything being the same.
Thanks!!
Any help/suggestions will be nice.