How do I cover up a scene haircut?

My hair was really long and it's naturally straight. I thought it looked too flat at the top. It's far too fine textured to really work with, plus it gets greasy really easily. I decided to get a "scene" haircut to add volume to the top with some short layers, leaving the hair underneath long. I really regret getting it cut, it looks more like a mullet to me! I really miss my long hair and cannot afford hair extensions at the moment. I know it will take forever to grow back and I'm completely unwilling to cut the long part short. I was wondering if there are any ways to help hide my shorter layers until they grow a bit longer. The shortest layer is about 2 inches in length and a majority of the layers are about 3-4 inches in length, meaning they come to about the top of my eyebrows. I have some of my old, long cut hair pieces and I was also wondering if there was any way to make at-home extensions. I really need advice!