It originates from a McDonald advertisement in Japan at which McDonald shouted "lan lan lu" 蓝蓝路. In the Japanese McDonald website, it said when McDonald is happy, he will shout "lan lan lu" 蓝蓝路.
PS: There are some of the emoticons which I couldn't find the names. If you know the names or have other emoticons, please leave the names or links in the comment box. Thank you!