I thought I would post a link to the photo editor I use and love. Since I shoot with a Pentax, it's a given that I walk the road less traveled. LOL! Same goes for this photo editor. It's called Sagelight, and has recently undergone an upgrade. You can get a 30 day free trial, right now, the price is $39.99, but that's going to change soon, probably.

Anyhow, I don't know this guy, don't get a kickback from him and am not in any way associated with this except as a happy user of the product. One of the upgrades is the ability to edit bokeh. For some reason, I am having a blast with this. I also like to support small business and this one guy has created this program all by himself.

I tried using Gimp, Irfanview and Paint.net because they were free, but the learning curve with those was steep. I didn't get them at all. This program is easy for me to use and the video tutorials are simple to understand.
Here's a link to the Sagelight blog if you are interested in checking it out. http://www.sagelightblog.com/ If you scroll down towards the bottom of the page, you can see the boekh part.