I tried to keep it simple. I found these great LOVE sayings, printed them out and put them in simple black frames. You can download them for FREE here: The Girl Creative and here: 4shared.com
For the smaller frame, I just printed my LOVE saying at 90% of the original size and taped it onto some pretty scrapbook paper I had - then popped it in the frame.
Next I hung up my Valentine's Wreath w/felt roses (tutorial here) on the mirror and added a few chocolates to my vase (along with two of my favorite pictures in pretty frames) and VOILA pretty decorated mantel!