Well me and my girlfriend have been going out for a fair while now (18 months or so) and it is both our first real relationship. We have been 'sexually active' for want of a better phrase from about 3 months into the relationship but we both agree that although it would be good we don't want sex at the moment. We have however done things such as oral sex and me fingering her etc and I can pretty much make her cum all the time however I lack in the imagination department and I was hoping for a few suprises I could give her to spice things up a bit. However when I look around for some things they usually involve either intercourse which we don't want at the moment or sex toys which I don't want to go out and buy and have around the house.
Any help / ideas would be appreciated on how I can make things a little more intresting, basically I am looking for an 'advanced' guide without sex if you get that 
Thanks!
Location. A new location or situation can really spice things up. The thrill be being discovered always makes things more interesting for me.
And, I've never tried it, but there are places on this message board you can read about it, food. If you don't want to buy sex toys, there are plenty of foods people use instead (or in addition). Chocolate syrup, it gets sticky though. Honey too.
Use sex toys, a small vibrator or vibrating panties, etc.
Or how about a long erotic bubble bath with wine and candel light? and all that follow by an oil massage. Sky is the limit ...
Speaking of food... If you like the stuff, marshmallow creme can be an awesome 'sex spread'! I've gently spread it on my wife's breasts, and drove her crazy licking and sucking it off. Enjoy!
Food, lets see their are a lot of good ones, I'll tell you the ones I've used before:
Ice cream, ice, chocolate syrup, whipped cream, pudding, icing, I know there are more but thats all I can think of right now.
Food is a lot of fun, it tastes good and feels good too, then afterwards you are all sticky then you both can get in the shower together and help wash each other off.