My policy is pretty standard, about what you would expect from most creators:
• Include my object meshes in your lots. I'd appreciate a credit and a link.
• Include my original meshes with your recolors. If it's a recolor of a repositoried object, please include the master object only.
• Include my Body Shop stuff with your sims, with credit and a link.
• Include my creations in your stories and movies.
• Alter my meshes to create new content.
• Claim my stuff as your creation.
• Repackage or redistribute unrelated objects/accessories with your lots. Provide a link to the original content instead.
• Upload my stuff to paysites. Keep it free.
• TSR. Just don't, m'kay?