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.
North is NOT up
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.