The Ring Nebula has a very nice set of data. It’s very fun without a lot of odd things to deal with. I included the faint outer structures which resemble petals of a carnation but they are a bit underexposed and blurry. You can see them better here in an image which combines Hubble data with imagery taken from the ground.
Red: hst_07632_01_wfpc2_f658n_wf_sci
Green: hst_07632_01_wfpc2_f502n_wf_sci
Blue: hst_07632_01_wfpc2_f469n_wf_sci
North is NOT up
Copyright information:
Hubble data is public domain, but I put a lot of work into combining it into beautiful color images. The minimal credit line should read: NASA / ESA / J. Schmidt
This work is licensed under a Creative Commons Attribution 3.0 Unported License.