IMPORTANT* CLICK SHOW MORE BELOW TO SEE MORE INFO AND HOW TO GET THE FOCUS BLUR PLUGIN. How to add a custom bokeh heart effect in GIMP using the Focus Blur plugin. Get the focus blur plugin free here: http://www.registry.gimp.org/node/8236 This video has text annotations, remember to switch your annotations on if you want to read the instructions. This video is in HD, if you can't see clearly, play it full screen.
To install the focus blur plug-in in GIMP in Windows, go download the zip from the link shown above. Open the zip file, in the zip navigate to lib/gimp/2.0/plug-ins then copy the focus blur exe, then go to c:\users\[your user name]\.gimp-2.8 and paste it in there and restart GIMP.