How to obtained customized fortune cookies?

The GoPets currency is known as the shell (they are simply colored seashells); green shells are the lowest denomination, pink shells are second, and gold shells are considered the most valuable. At the trading forum, some players consider the exchange rate for shells to be 1 gold shell equals either 100 pink shells or 1,000 green shells; a pink shell may be traded for 10 green shells (although there is no official exchange rate, and trades vary). All types of shells, as well as numerous items, may be found in fortune cookies; Green Tea Fortune Cookies are given Daily to un-subscribed users, while normal Fortune Cookies are given to the Subscribers. Both can give out food and shells.