A formal link exchange generally refers to an internet based system that is set up to facilitate these sorts of link exchange. There are some well known link exchange systems on the web that are easily found via a web search.

Lovely, hand painted and signed, 6" square spring flowers tile. The flowers, which are painted on the diagonal, are tulips, a daisy, and a hyacinth and are on a yummy, spring green background. The signature looks like ___ Rush. I can't make out the first part. The tile, itself, was made in Japan. It sits in a gold colored, wire frame/stand that lifts it up a little over an inch. The tile can easily come out of the wire frame if you wish.