Thanks L.D. Goodwin for introducing me to the Blitz poem!
The "official" rules are as follows (taken from Robert Lee Brewer of Writer's Digest):
•Line 1 should be one short phrase or image (like “build a boat”)
•Line 2 should be another short phrase or image using the same first word as the first word in Line 1 (something like “build a house”)
•Lines 3 and 4 should be short phrases or images using the last word of Line 2 as their first words (so Line 3 might be “house for sale” and Line 4 might be “house for rent”)
•Lines 5 and 6 should be short phrases or images using the last word of Line 4 as their first words, and so on until you’ve made it through 48 lines
•Line 49 should be the last word of Line 48
•Line 50 should be the last word of Line 47
•The title of the poem should be three words long and follow this format: (first word of Line 3)(preposition or conjunction) (first word of line 47)
•There should be no punctuation