What sort of gift should I get for our 6 month dating anniversary?

My girlfriend and I have been dating for 6 months on the 2nd of July. We've done everything from dinner dates to the hanky panky in a partially candlelit romantic setting. I'm looking for an inexpensive gift to give her personalizing what we are. Ive been around the internet searching for gifts but they costs wayyy too much. Help me find something ??Thanks :)