Here is the planetary NGC6722. It lies about 4100 lyrs away in Aquila.

The outer shells are quite colorful. The inner cavity is devoid of color. While there is gas in that inner space around the star it is a low density bubble that isn’t very bright. The host stars for most planetary nebulas are whitish. This one is bright blue due to its extremely high temperature indicating its
still in the early stages of dying.

PlaneWave 12.5″ Astrograph with ZWO ASI 6200 camera, Astrodon filters, and ASA gearless DDM-85 mount. F/8 LRGB (20/8min L, 7/8min RGB each, all 2×2 bin).