Hang some pictures of the two of you.

If you want to really show your mate you really care about them, an easy way to do it is to hang some pictures of the two of you up in your house. Pictures from your vacations, or from the holidays it doesn't matter. Get the pictures blown up to an acceptable size and position them around your house in areas that they mesh with. Vacation pictures or Holiday pictures can go in the living area while pictures of you in the rain might work well in the bathroom. Pictures of the two of you in restaurants might work well in the kitchen or dinning area. Save pictures of the two of you kissing or hugging for the bedroom. Keeping images of great times you have had in the past help to cement your relationship and give you a constant visual reminder of how much fun you have together. I would suggest getting pictures you have taken through the years instead of getting some professional ones done, the one you take seem to have a more personal feel. You might have to rely a little on others to take pictures of the two of you, but no matter where you are someone will always be their to lend a helping hand.