Here's the Helix, NGC 7293, in Ha/OIII bi-colour with RGB stars. The narrowband data was collected from home over several nights in August and September, and the RGB is from Glen Aplin on 6-7 September. Total data was 43 hours narrowband and 5 hours LRGB.
If you're a fan of traditional or muted colour schemes.... sorry
Scope: Ceravolo C300 @ f/9 = 2760mm FL, Atlas focuser
Mount: AP900
Camera: U16M
Filters: Astrodon E series Gen 2 LRGB
Guiding: Lodestar / MMOAG
Image scale: 0.67 arcsec/pixel
Exposures: 43x1800s Ha, 43x1800s O3, 5x900s R/G/B, 8x600s Lum (43 hours NB, 5 hours LRGB)
Processed to death in PixInsight using a bunch of new techniques developed on the fly.
Hope you find it interesting even if it's not to your taste...
High res version is available here:
http://www.astrobin.com/68705/
Cheers,
Rick.