Thanksgiving and Christmas are the only two holidays that I am guaranteed to decorate for way in advance. Every other holiday decoration throughout the year is at great risk for not being up until the night before or something.
This is why it is kind of momentous that there are Valentine's decorations on the mantle on February 1st. Free prints from here and here helped (as did some patterned paper and a heart punch) along with a quick trip to Ikea for white frames. The heart lights also came from Ikea, but I have had them for a couple years now. Some candlesticks help it be a glow-y and romantic.
This was so simple to do and I am so happy to see the mantle all lovey-dovey...maybe I should decorate for holidays in a timely manner more often.