Thanks, all!
Here are some slightly smaller orcs (not quite finished - they need a bit of work around the eyes and maybe a few more highlights; also, I'm out of the green I use for clumps of grass on these bases). These are Caesar 1/72 - "Orc Warriors 2". They're great little figures that would work well as Middle Earth orcs in 28mm. Also, they're made of a nice, carveable plastic that takes superglue and paint very well - more like a harder Reaper Bones plastic than the usual 1/72 stuff. Some of the weapons are a bit odd - those war-club things - but I'm swapping some out in later bases with weapons from Oathmark orcs and the like. I'm also adding Oathmark shields to some.
This is the start of some 1/72 armies for Hordes of the Things and L'Arte de la Guerre. I bought quite a few 1/72 boxes last year for the creation of a portable set of RPG miniatures (penny bases, magnetised boxes, very light and portable). As all gaming is likely to be home-based/remote for the foreseeable future, I've switched back to 28mm for RPGs for now (bigger miniatures show up better over Zoom), and in any case, I have loads of spares. A box of Dark Alliance 1/72 typically gives 10 or 12 individual miniatures four times over, so that's a full set for RPGs and a whole HotT army. I've already got some 15mm goblins based up on 28mm HotT bases, and they work very well with 1/72. So, in time, I might transfer all of my 28mm HotT stuff to individual bases - especially as these large 1/72 orcs (as warbands) and their small kin (as hordes) would work fine in a 28mm game anyway.
I'm going with a vague desert theme, to match the gaming mats we have and because I've got a lot of Saracens and the Dark Alliance 'nomads'. So these 'orcs' might actually be ghouls or hinn or something similar.