I don't know about you, but when Harry describes Snape as "sallow" or "yellow," I take that seriously.  Why Snape may have that coloring is debatable, but the skin tone itself isn't, as far as I'm concerned.  Despite the repeated descriptions to that effect, however, I haven't seen any Snape skins for download with an actual yellow cast to the skin.  Therefore, I've made some myself.

All my Snape skins come in three different skin tones:

• Jaundiced (found under the game's "light" skin tone),
• Sallow (found under the game's "medium" skin tone), and
• Normal (what would normally be a "light" skin tone, but found under the "dark" skin tone for this body type)

The different skin tones are pictured in the previews on the individual pages, although the differences are easiest to see with the swimsuits and heads.  All these skins and meshes are either my own creations or — in the case of the meshes — derived from the Maxis default files.  Therefore feel free to download/modify/distribute them at will.