from pixel art maker: storyspin TS swapspin swapped storyshift swappedspin sans : r/Undertale

Spinswap - Sans Hopes And Dreams (Original Pitch)

Spinshift Sans and Papyrus by flambeworm370 on DeviantArt

StoryShift swapped 5 times by CARNO-POWER on DeviantArt

Spinswap] The main cast + Alphys by NewAbyssiniaDraw4521 on DeviantArt

spinshift sans reference by IsRei on DeviantArt

Sprites of Sans and its switched counterparts, made by me, hope

revertswaprevertswap sans and papyrus sprite

Storyspin - Sans Fight (by XNinjaRayX)

Story!Swap Sans by PunkinxPie on DeviantArt

showcasing revert swap swap sans on sand[read desc] from swapswap

ArtStation - storyspin sans and papyrus (my take)