I am a big believer in decorating with flowers. They can improve a room the way a scarf can improve an outfit.
I think the reason that fresh flowers, like these lilacs, feel so special is because they are perishable. They will only be in bloom for about a week (and last in water 3-4 days) and then they are gone for the year.
Decorating with flowers shows that the room is tended - that the flowers are supposed to be there because someone just put them there. Does that make sense?
In the same way baking cookies or a cake for a visit sends the message that you are happy to have guests, decorating with flowers heightens the beauty of a room and silently says, "Enjoy this."
Of course you need access to a blooming tree or shrub (if you don't have any, ask your friends), but when something this gorgeous requires only clippers, water and a vase - how can you not decorate with flowers?
It just might turn the room, and your day, around.
*LILAC TIP: Since they have woody stems, smash the ends with a hammer or carefully cut slices at the end of the stemo to allow more water to be absorbed.