For me the main one is the flowers, I get the $5 bunches from Aldi and often can get 2 weeks out of them. I've got some yellow flowers at the moment that are going on 3 weeks now!
Singapore orchids are not only beautiful but last for ages too!
Supermarkets often have them in their flower sections
Agree that the decluttering and the cleaning of windows etc helps to brighten up the place.
My home needs a bit of a spruce up too.
here are some links I found of recent home decor trends that might give you a few ideasLink 1
( LOVE the slide staircases on this page - scroll down a bit)Link 2
I have seen little bottles similar to these in Bed Bath N TableLink 3