I decided that my old Batman shirt needed a revamp, since I hadn't worn it in ages and wanted to do something fun with it. I thought that this might be a great way to make a boxy t-shirt slightly more feminine, while keeping the superhero charm. :)
Cut a piece of interfacing of the same size and shape of your shirt's logo.
Turn your shirt inside-out and iron the interfacing onto the back of the shirt's logo.
Decided how much of the logo you want to be cut out. Mark this on the shirt (I used a tailor's pen for this). Cut out the inside piece that you don't want, leaving a small allowance to be folded over, and tack a hem around the edges.
Once all of the edges are tacked, iron them flat. After this, you can choose to hand-stitch or machine-sew them down, but this step is optional.
Cut a piece of black lace large enough to cover your logo-hole and position it as you choose.
Tack your lace into place and try the shirt on just to ensure that you're happy with it.
Machine-sew (or hand-stitch) the lace down by sewing along the edge of the logo, also securing the hem, remembering to finish of with a few back-stitches to secure it.
Remove all tacking.