There are things that make a woman see a man as a romantic creature. These things that women notice most of the time are petty little things. Let's say a glance, putting your hand across her shoulders or a touch across her back. Naturally, most men use flowers as a way to express their feeling which women see as a way of being romantic, but haven't that become a cliche. That will only go so far. You have to mix it up, change your way/method, and use your instincts to create romantic moments.
The most important key in creating a romantic moment is to put your woman like ahead of your own.
It's so easy to create romantic moments, but not all men in the whole universe still "get" this. All you just have to do it to figure an activity around what she likes to do. For example, does she like going shopping, or going out for dinners, visiting the beach, watching movies and so on and so forth. Just have a concept of the things she enjoys doing.
If you want to be romantic with your lady, just go ahead and do something she likes with her. Now imagine doing that thing when it doesn't feel convenient on your schedule, it will make the activities seem even more romantic to her. For example, if you choose to do something she likes to do with her when a ball game is on TV that you could be watching with your buddies. She will feel chosen, loved…and that, sir, is VERY romantic indeed.
The kind of activity you choose to engage in with the lady that you want to think of you as romantic doesn't matter at all. All that matters is for you to be completely involved physically and mentally in the activity and not staring off into space or obviously just wishing it were over so you could go do what you really want to do. It is you trying to be romantic so focus on the project at hand.
As you have seen now that it is very easy to make romantic moments. Just with thinking and planning, the best remarkable romantic moments can happy daily and at the most unexpected time. There should be no absolute reason not to make a romantic moment happen at every little opportunity you have because being romantic as a man is a win/win situation. So get out there and prove to your woman you can be romatic...*winks*.