Is alliteration always next to each other?

Not always, for example:

bald is beautiful crimson and clover dialing for dollars form over function too hot to handle add insult to injury jump for joy a labor of love the more the merrier naughty but nice the proof's in the pudding rule the roost Sell the sizzle, not the steak. too little too late Walking in a winter wonderland

There's a complete list of Alliterations here:

http://englishpatterns.com/community/viewtopic.php?t=12 Also read Thank You for the Thistle by Dorie Thurston. Here are some examples from her book: Then as Brent Bernard gladly gazed through the glistening glass, he gasped, "Gee, Great Aunt Nellie, why aren't any golden goldfinches going to the goodies?" "Oh," said Aunt Nellie, "They thrive on thistle and I thoroughly thought that I threw the thistle out there."