The needles grow around the branches like a spruce but they are quite soft.
I am only going by what I have seen pictures of.
I'd guess Englemann spruce given your location.
If I was going to bonsai a full sized spruce, I would go with a blue.
Thank you for the link, I shall read it all. I'm really iffy on trying spruce as is, in fact I'm not big on any conifer but I'm trying to find a tree the will go well with a old brown pot that came from a family member. Maybe I should just buy a big ugly juniper shrub instead.
The only exception are hemlock or tamarack.
zone 4
Also thinking about a dwarf lilac