
@holly You could make an eye of partridge sole, but make sure to correct for the different row gauge between the top of a stockinette foot and sole (add in a short row every X rows. It's what I did on these with just the forefoot. I had to insert a short row for every 4 stockinette rows (so 6 sole, 4 top)
Another option would be all over colorwork.
@holly this might be what you seek.
paging @DoubleTreble
Pattern 1: optional double knit soles: https://www.lovecrafts.com/en-us/p/zig-zag-socks-knitting-pattern-by-lucy-neatby
Pattern 2: toes, sole & heel with yarn held double https://www.lovecrafts.com/en-gb/p/the-duke-commands-socks-with-double-thickness-heels-soles-and-toes-knitting-pattern-by-the-wee-duchess
No pattern, but option 3: slip stitch the toes, sole & heel of a standard sock pattern (like this heel flap https://www.knitfreedom.com/blog/slip-stitch-heel/ )
I think the term is "padded socks"
Like this
https://www.ravelry.com/patterns/library/vanilla-padded-socks