Silicone earbud covers?

Has anyone put on silicone earbud covers to existing headphone earpieces (like the standard apple ipod headphones)? If so, where do you order those (could you paste a link)?

http://www.cellphoneshop.net/cleaco.html?CAWELAID=507290421&catargetid=530001600000016689&cadevice=c&cagpspn=pla&gclid=COerloOrtrwCFVGBfgod6x0Aag

Personally, I’d just get earbuds you like that have silicone covers standard (ex. Yarbuds).