Two years is a very short amount of time to find yourself needing some spice. No one person can spice up a relationship. Both people have to feel (the need) to do so.
If only one person is coming up with ideas, suggestions, and making an effort they will eventually become resentful. This is why communication is so important. It's the GPS tool that lets you know if you are on the same page; "growing together" or "growing apart".
Another key factor to consider is whom you are with. Some people are content with the way things have always been. If all of sudden you show up to bed wearing a red teddy, holding a bowl of crushed ice and a bottle of chocolate syrup that could scare someone.
Exchanging fantasies is a good way to start a conversation. If one is uncomfortable doing so they can always claim they had the "strangest dream last night." I dreamed we were....etc or I dreamed you did.... to me
Being (unpredictable) always spices things up (joining your mate in the shower, giving him or her a massage, leaving a flirty voice mail message on their phone, or putting a greeting card on the dashboard of their car before they go off to work., having dinner in front of the fireplace, playing an adult board game, watching an adult DVD together, having a date night, a weekend getaway at romantic themed hotel.... The only limitation is one's imagination!
However as I stated earlier in order to succeed at spicing up a relationship long-term it requires both people to make it a "priority". Both people have to(Keep it going) I wrote about this awhile back. http://hubpages.com/relationships/SecretLoversCale...
"It's easier to maintain a fire than it is to reignite a spark!"