I know Marigo made tuning dots for speakers, but I don't think they came in blue. Check out their website and see if that's what they could be. http://marigoaudio.com/vtstuningdots.htm
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I too have a pair of Sttaf's that came with them. A while back I got a chance to meet with and speak to Vince Bruzzese of Totem Acoustic a little while back and I asked him the same question. His reply was they do serve a sonic purpose (that I did not notice) but he told me that if they really bothered me that much(which they did), go ahead and remove them. So all I did after I took them off is stuck them on the back of the cabinet(just incase I have to send them in for any reapirs. At least that way they'll know which tweeters were used for my paticular speakers.