There are a number of options to make your quilting "pop":
1) As mentioned, a trilobal polyester thread would reflect more light.
2) You could use a contrasting color instead of a matching color of thread.
3) Switch to a thicker thread (40wt). If needed, you could use Thread Magic to reduce friction/fraying.
4) Add trapunto/faux trapunto. Trapunto is stuffed work. Faux trapunto adds an extra layer of batting under featured designs & then is densely quilted surrounding those designs, typically with a thinner thread like a 60/2 cotton or a 100wt silk.