One of my pet hates are the ubiquitous decorative wooden letters featured in every homes magazine and style magazine since forever. They just seem so unoriginal to me especially when they spell out the action to be performed in the room they are put in, i.e E....A....T in the kitchen, L....O...V...E in the bedroom, C...R...A...P in the loo and so on as if the inhabitants might forget what happens where without 3 foot high gold letters reminding them at every possible occasion.
I also have a dislike of most wall transfers and also of feature walls decorated with flock or metallic wallpaper - stinks of 'Chavez' IMHO.
What decorative horrors make you shudder?