“The cobwebs in my house just became decorations! Thanks, Halloween!” is a jocular saying that has been printed on many images. “#ScaryTrue The cobwebs in my house just became decorations. Thanks, Halloween! http://ow.ly/i/11m9F  @Theatre_GRL” was posted on Twitter by Colette Saucier on October 13, 2012. The saying probably originated with this ecard.
     
     
Twitter 
Worn out Player @_@
@CrimsonShortOne
The cobwebs in my house just became decorations. Thanks to Halloween.
10:51 AM - 12 Oct 2012
   
Twitter
Colette Saucier
@Colette_Saucier
#ScaryTrue The cobwebs in my house just became decorations. Thanks, Halloween! http://ow.ly/i/11m9F  @Theatre_GRL
8:40 PM - 13 Oct 2012
     
Twitter
Newfy lover (ړײ)
@newfylover1
Thanks to Halloween… the cobwebs in my house have just become decorations!
8:14 AM - 15 Oct 2012
   
Twitter
Devaune
@devauneonline
Haha! “The cobwebs in my house have now become decorations! Thanks Halloween!!” #TooFunny! LOL
8:03 AM - 16 Oct 2012
 
Twitter
Leah Gleixner
@LeahCG12
Thanx to Halloween, the cobwebs in my house just became decorations!
6:20 PM - 17 Oct 2012
   
Twitter
witchescupboard
@witchescupboard
“The cobwebs in my house just became decorations! Thanks Halloween!” http://fb.me/29qjUVeZb
2:36 AM - 19 Oct 2012
 
Google Books
More One Liners, Jokes and Gags
By Grant Tucker
London, UK: The Robson Press
2013
Pg. ?:
I love Hallowe’en ... the cobwebs in my house just become decorations.
 
Google Books
The Narrowboat Guide:
A complete guide to choosing, owning and maintaining a narrowboat
By Tony Jones
New York, NY: Adlard Coles Nautical
2016
Pg. 188:
I use my feather duster all year round, except at the end of October when the cobwebs become decorations thanks to Halloween.
     
20 October 2016, Lincolnshire Echo (Lincoln, UK), “Builder’s tips to enjoy a spooktacular Hallowe’en,” pg. 21:
Other decorative stuff includes bats, owls, spiders, graves, skeletons, cats and witches. You can leave those cobwebs too - at Halloween they become decorations!
   
Google Books
It’s Complicated:
A Love Story and Memoir
By Izzie BeBe
Lulu Press (Lulu.com)
2017
Pg. 157:
“The cobwebs in my house just became decorations! Thanks, Halloween!”
 
Google Books
It’s Complicated:
A Love Story and Memoir
By Izzie BeBe
Lulu Press (Lulu.com)
2017
Pg. ?:
“The cobwebs in my house just became decorations! Thanks, Halloween!”
   
Elite Daily
The 34 Best Instagram Captions For Halloween Are Here, So Spook On
BY MARISA CASCIANO
October 17, 2018
(...)
7. “All of the dust and cobwebs in my house just became decorations. Thanks Halloween.” — Unknown