<a href="http://stars.astro.illinois.edu/sow/n6565.html" rel="nofollow">NGC 6565</a> looks to me like a miniature Ring Nebula. I'm rather fond of these nebulas with rather rainbow-like gradients from blue in the center to red at the perimeter.

I made an effort to reduce the size of the stars which would otherwise be bright green due to the green channel being f555w.

Red: hst_08773_01_wfpc2_f658n_pc_sci Green: hst_07501_01_wfpc2_f555w_pc_sci Blue: hst_08773_01_wfpc2_f502n_pc_sci