It depends up on the AdImage and the text you are using ...
Make a Border for the image with Green or Orange and then use this Adcopy and test it... BTW what are you promoting CPA offer or Fan Page???
iiNoob,
4rUzzz has some great suggestions. You should also experiment using images of young attractive women. They tend to convert better than anything else.
Make sure you have a compelling headline with a good value proposition. In other words, tell the viewer what they are going to get by clicking on the ad. Also provide a call to action such as act now, or contact us today or some kind of language enticing the viewer to act.
You can find some good examples here,
Hope that helps,
Shawn