I only saw pictures of ones that looked like three of the small humanoids, and that's all I know.
There are even people who say that their craft are organic, biological and intelligent, or something along those lines, but I don't know that for certain, only what I saw.
It really would make sense, if had the tech, to create clones or androids to send out to minimize the risk to your species. Just look at all the tech we've sent to Mars and beyond.
I still hope aliens look like this: