I agree with everyone else. Dont put 8 lug wheels on a 6 lug truck. If you really want 8 luggers, you could swap axles for something bigger. Then you could run them no prob.
My personal favorites for a 6 bolt square are stock rally rims with a nice trim ring. Second favorite are plain 15x8 steel wheels in flat black. White spoke wagon wheels are tied for second. They look good in black too. As far as after market wheels, classic 80s turbine mags or slot mags look great.
I have a cool looking chrome steel wheels with holes in them on my blazer that came with it.
4x4 GMT400 wheels won't fit on a square becuse of the hub size, but squarebody wheels will fit a 90s Chevy.
Old Toyota 6 luggers will fit, Nissan wheels will also work. Had a set of Nissan steel spoked wheels on one of my trucks.
In my opinion though, no matter what rims you get, they've gotta be 15in.
I don't really like any thing bigger than 15s on a square.
A buddy of mine wanted to put 18in god awfuly ugly rims on his, I wanted to slap him.
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Those are all my wheels except the first pic. All my favorites