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An easy, fun prank is to blow up a bunch of balloons and fill her room with them. Do this when she is out at work or over at a friend's house. Make sure the balloons fill the room completely. Shut the door after you have filled the room so she is in for a fun surprise when she opens her bedroom door. Go for balloons in your girlfriend's favorite color to add something a little special to the prank. Another good way to prank her space is to cover her room in bright post it notes from top to bottom. Layer the Post-It notes all over her furniture, the walls, and the windows in her room. Put Post-Its on her computer and other items. Do this when she is away for the night or out of town. That way, when she comes home, she'll be in for a fun surprise. Tin foil is a cheap, easy way to pull a prank on your girlfriend. Wrap all the items in her bedroom in tin foil. Put tin foil all over the items in her bathroom or her living room. Choose a room she uses often and make it harder for her to access by using tin foil. If you have the time and energy, wrap her belongings in several layers of tin foil. This will make it harder for her to unwrap each item. Make her shower nice and "toasty" by placing slices of toast in her shower. Position freshly toasted slices of bread in her bathtub. Then, wait for her reaction when she goes to take a shower or a bath.
Fill her room with balloons. Cover her room in Post-It notes. Wrap her belongings in tin foil. Place toast in her shower.