The LG Ally from Verizon has long been rooted, but a custom recovery – which is needed to flash custom unofficial ROMs – is now available via one of our code-toting members in the AndroidForums – drellisdee. While there are no ROMs to be had just yet, this should encourage the community to start cooking some up as there are now no holds barred on your device (and it also enables some other useful features such as full image backup and restore). Go ahead and check the thread out for download links and instructions if you want to get started with this.