One of my favorites is me laying down on the bed and having the guy stand and face me. It offers a really direct method of penetration.
Some things to keep in mind when using your imagination to create new sex positions:
-Keeping your legs together or crossed will make the penis feel thicker. Likewise, having your legs spread will allow more room, which can make for a more pleasurable experience if the penis is very thick.
-Entering from the front or more directly will allow for deeper penetration, which can make the penis feel longer. Likewise, entering from behind gives the penis more distance to travel, and can make for a more pleasurable experience is the penis if very long.
Don't be afraid to play with toys, lube, food, or pressure. Don't be afraid to say, spur of the moment "hey, move over there!" Sometimes simply having sex in different areas (the bathroom instead of the bedroom, on the couch instead of the bed, etc.) can lead to a new experience.
This website can be very fun and exciting to view. Maybe you and your partner can both pick a few that you think sound good and make a game out of it:
All Sex Positions