This day is a day of love and friendship what better way to demonstrate you friendship than to introduce your friends to Jesus Christ, what a great time to give a gift that really can change your spouse or that friend whom you really care about. wouldn't this be an opportunity to show what real Christian love is about?
I wouldn’t advice to give someone a Bible as a Valentine’s gift unless you believe it will be well received. Here is a hint, instead of giving candy or flowers how about a gospel music cassette, or a book that glorifies God. Just use your imagination.