I don't think a 7-5-7 pattern exists for haiku or senryu actually - that wouldn't be minimal enough for haiku/senryu expression. Modern western haiku recognises the 2-3-2 metric feet rule that is more flattering to poems in English.
I've just started dabbling in senryu and tanka so I may be embarrassed that I posted these once I get a bit more skillful but here they are anyhow. Feedback welcome.
snuggling in bed
everyday is Mother's Day
when you hug me back
wee arms stretched upward
gesturing for the first time pick me up mama!
climbing on my lap
you sneak your arm around me
and say ... “I'm hungry”
I really enjoyed these, especially the ones about fingernails, the mirror, and the dish mop mike. I plan to print them in my diary as inspiration. Shall I attribute them to "marsupial mama," or would you prefer me to use your real name?