Whether you've measured incorrectly or happened upon inexpensive blinds in the wrong size, occasionally you may have a window that's too tall for the blinds that you own. That 2-inch gap at the bottom of the window is unsightly, but there is an easy trick to address the problem. Adjust the blinds and create the illusion of length with a quick cover-up. Your blinds will reach the bottom of the window, and no one will know that they are too short.
Remove the blinds from the hardware that holds them to the inside of the window. Detach the hardware from the window frame.
Measure from the top of the window frame to a spot 2 inches lower. Reattach the blind hardware inside the window at this point. Install the blinds back into the hardware. Lower the blinds to make sure that the bottom of the blinds touches the bottom of the window.
Install the curtain rod hardware according to the package directions 1 inch above the window frame and 1 inch to the right and left of the window side edges.
Slide the valence fabric onto the curtain rod. Attach the curtain rod to the hardware that you just affixed to the wall. The valence will hang down over the top of the blinds, camouflaging the top of the blinds, and hiding the 2-inch open space.