RE: Marking servo leads
You may have to actually go to a Store, sometimes not everything is always listed On-Line, but I have seen them and purchased the small ones in multi colored assortments from Harbor Freight; most other Stores ie: Lowes, Home Depot, Automotive Shops; have small ZipTies but only in Black & White. I think Radio Shack carries Multi colored Zip Ties.
Those Pre Marked Shrink Wrap Labels you have shown, I would bet the Lettering will rub off easily.