Every relationship grows and adjusts and changes over the years, and it should be in more than just the emotional ways. Having a partner being fully satisfied helps to ensure a happy relationship.
Now, when I say add spice I don't (necessarily) mean to get ball gags and leather whips. Adding spice can be something simple like a silken scarf to blindfold your lover, it can be a simple toy like the clit dancer reviewed on "what lesa likes."
If you are the willing participant and your lover is more hesitant start with something simple like a rose or feather. What could be less intimidating than a rose or feather? If your lover won't be blindfolded have them close their eyes, then slowly trace the tip of the rose or the feather along their skin, as soft as you can. Their skin will come alive with the gentle sensation, be aware of how "into it" your lover is, tweak a nipple or offer a soft love tap to their backside to tease. It may help bridge the gap into broader sexual play.
When you think outside the box you may find all sorts of toys to bring into your play from around your house.
~Food (Berries, whipped cream, chocolate)
~Soft fabric (satin, silk)
So enjoy yourselves and try some new things in the bedroom. :)