If you're looking for manga similar to Jewelpet Kira Deco!, you might like these titles.
I met a Mahou Shoujo; and so began my story. "Then I will become a Mahou Shoujo!" In order to save Hoshi Karen, the Mahou Shoujo who had protected her even while being pursued by tanks. Kokone, who was entrusted with Karen's Grimoire, decides to become that which is acknowledged as a "Calamity" by the world... a Mahou Shoujo!
After once being very popular in her generation, the magical girl Klan mysteriously vanished. But after 7 years, she has finally returned! Not just her height, but her attitude and even her breasts have gotten bigger! Watch her battle as her voluptous body is literally bursting out of her clothes!
If Madoka Kaname had known of the tragic transformation that would mark the end of her magical-girl journey, how would her story have unfolded? In this telling of her story, Madoka remembers the outcomes of her previous timelines—but so does Kyubey. Even with the knowledge of her previous lives, can Madoka outmaneuver Kyubey and avoid her fate?