Batiks are always lovely. Are your fabrics all muslins in that creamy off white color range? Or are they colored? If they are all in the creamy color Then I think a medium bright batik would be wonderful for your star; purple, blue, orange, bright pink.... so many choices that would just sparkle. Even some of those with several colors swirled together would work.
Otherwise, a photo of your background muslin fabrics would be very helpful in letting us see what the star color is going to pair up with.
Hugs and smiles