Try Sparkk. www.sparkk.com.au They have a huge range of digitally printed designs that are customizable for fabric and wallpaper. . . all printed in Sydney. Good luck!

I'd search Designers Guild. Or Porters Paints. But others will be along with ideas.

Love the steam punk vibe. Always check in with the artist prior to using their art as most times they would be flattered to have someone hang it on their wall especially a giant sized version. Pity you couldn't have a pulley system? mural where if that background got a bit old you could change it up with a new steampunk art piece and design the pulley to have cogs not only for function but for aesthetics as well. Have a big brass button with "Push here" to activate.

Its funny how we have different tastes -- I love art , but I think the wallpaper is too 'arty' , if that makes sense . Wallpaper with larger leaves I like ( probably moreso in an entrance or bedroom , but it would work here ) but that particular design doesn't gel with me -- if the wallpaper design was an art print say 1200 x 900 in a white frame , against say a light green wall, even a 50's mint tinge , would look great in my opinion , but anyway . . . . . . . . . And again just personal preferences , I actually like the 'before' kitchen as it was , especially the mix of wood/white/led on the bench , and the industrial lights -- the new light is too fiddly for my taste . The white tiles are an improvement , and maybe I'm lazy haha , but that would have been the only change I would have done -- actually , to be honest , with that wallpaper , I would have been at least as likely to have gone with emerald green tiles / splashback to reference the wallpaper , rather than effectively the 2 colouir zones you have now . Yes , I'm probably weird .