I think Christmas is the perfect time for sparkle, bling and bad taste.
I love (other people's) amazing tacky Christmas "stuff". I love over-decorated houses - especially when the owners are using them to raise money for charities (but I'd not go all out myself)
I love tacky blingy Christmas jumpers - as someone else said, they are supposed to be ironically tacky. Mine is tasteful due to my horror of being "noticed".
And I have some gorgeously tacky Christmas earrings made from, I think, FIMO, and bought at a craft fair, with naked Santas covering their embarrassment with their hats.
Re painting metal bistro garden set
Army horses loose on London streets