I cut my white shirt to look like a cropped top. I cut the sleeves out and the neckline for more cleavage.
I forgot to take photos, but you can cut it to any way you want!
I also cut the bottom part, the front of the shirt is shorter than its behind to make it look a bit nicer (base it on the photo)

I actually did this with another black shirt since the sleeves were too tight and the neckline choked me (it was a gift from my cousin) and plus it looked a lot better as a cropped top.

Anyway, I used to scrap fabric of that to make the cross. You can purchase your own black fabric to make the job easier, since I still had to straighten the fabric out and cut it to make it straight and all.

Then after I cut and sewed the black fabric together and pinned the cross to the position I want it, I start sewing!

After you sew and fix everything, you're now the owner of a new cropped top! c:

You can also create your own design by cutting different colors of fabric and different shapes to suit your taste. Much better than owning another dreary white shirt!