There is an extension for Firefox called the El Jay Icon Maker, found here. It lets you right click on any picture in your browser and create an LJ icon from it, then upload it to your LJ account (make sure you’re logged in first). You can do a quick create, which just makes a 100×100 pixel icon of the whole picture, or you can choose options, which lets you rotate, crop, etc. I created the icon for this post with just two or three clicks. Check it out!