Using hints of color in a room make me happy. Especially when those items are so easy to change out like pillows, curtains, and decor you have around the house like books and frames. I've been loving gold and pink lately.
If you are loving the room you have now and don't feel like changing it but you want to tie in some of your favorite flowers, getting one simple throw pillow that pulls out similar colors can do the trick!
If you want to go bolder, find some wallpaper or upholstery with a floral print/pattern. Anthropologie usually has some unique upholstered items. If you struggle getting real flowers into your home, adding a flower pattern might give you what you need for that spring feeling indoors. I'd love to have one of these in my office!
Most often we forget about livening up our bedrooms since all we tend to is sleep in here, but bringing some fresh flowers in and updating your bedding can really bring you into the season.