I've just uploaded the first set of Background items, "Shapes", to the HeroMachine 3 Alpha. I've included 21 different backgrounds for you in this set, which is a lot more than the first 2.x Background-Standard group, including your basic rectangles, circles, triangles, Union Jack, concentric target circles, a yin yang symbol, etc.
In addition, the basic program now has six more "Pattern" options, to allow you to apply basic dark-to-light gradients from either the top, bottom, left, or right, as well as one goes from the center out and one that's in a circle. They're not perfect, but they do let you do some things you couldn't before.
You might also play around with using this big giant Background Shapes to create some funky uniform elements, as well. Just move the Background item to the front using the "To Top Layer" button in the Transform tab. Hit the Mask button, and click on the basic Body. This works particularly well with the Background Shapes that have gradients built in, especially if you set both of its colors to 0% Alpha -- it removes the colors so the underlying Body can show through, but leaves the gradient, so you get a cool effect.