Think that your image is plain? I, Akane had taken time to create a new tutorial!
Open up Photo Filtre with an image, I'm going to use this one: click!
Next, click Ctrl + A to select the whole image, then right click on the image, Stroke and Fill. Uncheck the 'Stroke' button and Check the 'Fill' button. Then choose your colour that you want on your image and select a style. Never click on 'Fill pattern' Below is a screenie of a style. (You may change it to your preference)
Set opacity to below 50. and here's your done image! Click here for the image after the effects. (I set opacity to 30)