The hink pinks for "raining tulips" would be "showering flowers." Hink pinks are word puzzles where the answer is a pair of rhyming words that describe a given clue. In this case, "raining" and "showering" rhyme, as do "tulips" and "flowers."
flower shower
Lunch punch! :) These hink pinks are HARD!
http://www.makeuptalk.com/forums/t13127/hink-pinks-hinky-pinkys-hinkity-pinkitys-5-13127.html
cow plow
Grey day
roach coach
ham jam
neat feat
maize craze
bear tear
partial marshall
big fig